Tootfinder

Regular black holes with gravitational self-energy as dark matter
Kimet Jusufi, Douglas Singleton
https://arxiv.org/abs/2509.13335 https://arxiv.org/pdf/25…

Regular black holes with gravitational self-energy as dark matter
We incorporate the effect of non-local gravitational self-energy to obtain a neutral, non-singular spacetime geometry. This is achieved by using a non-local gravitational theory inspired by T-duality, where particle mass is not point-like but smeared over a region. This non-local gravitational self-interaction is derived from the Newtonian gravitational potential and energy density, allowing us to define a coordinate-independent quantity. Thus, we incorporate the non-local gravitational field i…

Complementarity between gravitational wave signatures and Higgs precision measurements of a classically conformal hidden U(1) extended Standard Model
Victor Baules, Nobuchika Okada
https://arxiv.org/abs/2508.13527

Complementarity between gravitational wave signatures and Higgs precision measurements of a classically conformal hidden U(1) extended Standard Model
We consider a classically conformal extension of the Standard Model (SM) with a hidden $U(1)$ gauge symmetry, where the $U(1)$ symmetry is radiatively broken via the Coleman-Weinberg mechanism. This radiative breaking then induces electroweak (EW) symmetry breaking through a negative mixed quartic coupling between the hidden sector Higgs field and the SM Higgs doublet. Due to the mixed quartic coupling, the original two Higgs fields mix with a small angle $θ$ to form two mass eigenstates, $h_1…

Zero-energy resonances in ultracold hydrogen sticking to liquid helium films of finite thickness
R. Karahanyan, A. Voronin, V. Nesvizhevsky, A. Semakin, S. Vasiliev
https://arxiv.org/abs/2509.14652

Zero-energy resonances in ultracold hydrogen sticking to liquid helium films of finite thickness
We investigated quantum states of ultracold hydrogen atoms in a combined potential comprising the H-He film interaction in the presence of a substrate and the Earth gravitational field. We show that the shift and width of the gravitational quantum states are determined by the complex scattering length for the H-He film-substrate potential. We demonstrate that for specific helium film thicknesses above a substrate, zero-energy resonances occur if the combined potential supports a bound state exa…

Gravitational Entropy
Sangmin Choi, Malcolm J. Perry
https://arxiv.org/abs/2509.10921 https://arxiv.org/pdf/2509.10921

Gravitational Entropy
We formulate the classical gravitational entropy of a horizon as a Noether charge that does not require the notion of a temperature, and which is applicable to horizons that are not necessarily associated with black holes. This introduces a correction to the covariant phase space formalism that accounts for the configuration-dependence of the generating vector field conjugate to the charge. The vector field is related to the proposal of Bousso that the gravitational entropy of a region is deter…

Little Red reionization factories
Fan Zhang
https://arxiv.org/abs/2508.13541 https://arxiv.org/pdf/2508.13541

Little Red reionization factories
In this note, we suggest the possibility that an elucidation of the nature of the numerous Little Red Dots (LRDs) at high redshifts, may facilitate the resolution of another concurrent cosmic puzzle, namely reionization. Specifically, it is hypothesized that intergalactic HI gas is compelled by the tidal field associated with a growing gravitational entropy, in the form of gas streams, into colliding at the LRD sites. The resulting shock heating and compression encourage starburst activities, w…

Role of Non-conserved Gravity Theory and Electric Charge in Constructing Complexity-free Stellar Models: A Novel Approach under Non-minimal Coupling
Tayyab Naseer
https://arxiv.org/abs/2508.13903

Role of Non-conserved Gravity Theory and Electric Charge in Constructing Complexity-free Stellar Models: A Novel Approach under Non-minimal Coupling
This study explores the application of complexity factor within the context of Rastall gravity, exploring its implications on a static spacetime admitting spherical symmetry associated with anisotropic fluids under an electromagnetic field. The field equations are derived for a static charged sphere that provides a foundational framework for analyzing gravitational effects in this non-conserved theory. The mass function is formulated by incorporating both fluid and geometric parameters, offerin…

Systematic Effects of Chaotic Magnetic Fields on Neutron Star Tidal Deformability: Implications for Gravitational Wave Constraints on Dense Matter
Debarshi Mukherjee
https://arxiv.org/abs/2509.12246

Systematic Effects of Chaotic Magnetic Fields on Neutron Star Tidal Deformability: Implications for Gravitational Wave Constraints on Dense Matter
We investigate the effects of strong magnetic fields on the equation of state (EoS) of neutron star matter and the resulting implications for tidal deformability measurements in binary neutron star (BNS) mergers. A critical issue with previous magnetized neutron star studies is the treatment of magnetic field anisotropy in the Tolman-Oppenheimer-Volkoff (TOV) equations. To address this fundamental problem, we employ the chaotic magnetic field approximation, which allows for a self-consistent tr…

$T\bar{T}$ braneworld holography
Shinji Hirano, Vinayak Raj
https://arxiv.org/abs/2508.11471 https://arxiv.org/pdf/2508.11471

$T\bar{T}$ braneworld holography
We study a constructive gravitational dual of two-dimensional $T\bar{T}$-deformed conformal field theories (CFTs) grounded in their two-dimensional gravity description. This framework can be viewed as a Randall-Sundrum-type braneworld, where two-dimensional gravity localized on the $AdS_3$ boundary is dynamical. Assuming the AdS/CFT correspondence, the holographic dictionary provides a straightforward translation between the $T\bar{T}$-deformed CFT and its gravitational dual. In particular, thi…

Imprints of quantum vacuum fluctuations on the gravitational field of a spherical mass
Ra\'ul Carballo-Rubio, Francesco Di Filippo, Shinji Mukohyama, Kazumasa Okabayashi
https://arxiv.org/abs/2509.10667

Imprints of quantum vacuum fluctuations on the gravitational field of a spherical mass
The Schwarzschild geometry, describing the gravitational field of a spherical mass in classical vacuum, is one of the most famous vacuum solutions of the Einstein field equations. Classical vacuum is an idealization that does not include quantum vacuum fluctuations of quantum fields, and determining the form of the gravitational field of a spherical mass in quantum vacuum is an important step towards understanding the interplay between gravity and quantum field theory. We formulate and prove ge…

Analytical modeling of the gravitational potential of irregularly shaped celestial bodies considering three distinct internal structures: application to (21) Lutetia
Marcelo L. Mota, Safwan A., Antonio F. B. A. Prado
https://arxiv.org/abs/2508.08538

Analytical modeling of the gravitational potential of irregularly shaped celestial bodies considering three distinct internal structures: application to (21) Lutetia
The classical polyhedral model is one of the most accurate methods currently used to represent the gravitational field of irregularly shaped bodies. However, it assumes a homogeneous density distribution, which may not accurately reflect the internal composition of real objects. This study aims to analyze the effects of the internal structure of asteroid (21) Lutetia on gravitational potential modeling by considering a three-layered composition with distinct densities. The gravitational approac…

Quantum nature of gravity in self-bound quantum droplets
Asma Tahar Taiba, Abdelaali Boudjemaa
https://arxiv.org/abs/2508.12838 https://arxiv.org/pdf/2508.…

Quantum nature of gravity in self-bound quantum droplets
We explore the possibility of testing the quantum nature of the gravitational field with an ultracold self-bound quantum droplet of one-dimensional Bose-Bose mixtures. To this end, we solve variationally and numerically the underlying generalized Gross-Pitaevskii equation which includes the effects of quadratic and cubic nonlinearities. We derive the associated generalized uncertainty principle and its corresponding minimal length. The obtained modified uncertainty relation enables us to search…

Preheating and gravitational waves in large-field hilltop inflation
Diganta Das, Shreyas Revankar
https://arxiv.org/abs/2508.07442 https://arxiv.org/pdf/25…

Preheating and gravitational waves in large-field hilltop inflation
The combined Planck, BICEP/Keck Array and BAO measurements of the scalar spectral index and the tensor-to-scalar ratio from the cosmic microwave background observations severely constrain or completely rule out several models of inflationary potentials. On the other hand, the data seems to favor concave potentials over convex ones. In this paper, we study preheating and gravitational waves after inflation in a large-field, regularized hilltop potential where inflation takes place in the concave…

Complete Integral of Primer-Vector Equations for Transfers in a Central Gravitational Field
Sergey Zaborsky
https://arxiv.org/abs/2508.03075 https://arxiv.…

Complete Integral of Primer-Vector Equations for Transfers in a Central Gravitational Field
This paper demonstrates the existence of a complete integral for the system of differential equations of Lawden's primer-vector, which is used in the optimization of space transfers in a central gravitational field. The derived complete integral has been shown to significantly reduce the order of the differential system for the primer-vector from sixth to second, thereby simplifying the optimization problem into a boundary value problem with four parameters. The presence of a complete integral …

Discovery and Analysis of Afterglows from Poorly Localised GRBs with the Gravitational-wave Optical Transient Observer (GOTO) All-sky Survey
Amit Kumar, B. P. Gompertz, B. Schneider, S. Belkin, M. E. Wortley, A. Saccardi, D. O'Neill, K. Ackley, B. Rayson, A. de Ugarte Postigo, A. Gulati, D. Steeghs, D. B. Malesani, J. R. Maund, M. J. Dyer, S. Giarratana, M. Serino, Y. Julakanti, B. Kumar, D. Xu, R. A. J. Eyles-Ferris, Z. -P. Zhu, B. Warwick, Y. -D. Hu, I. Allen, G. Ramsay, R. L. C.…

Discovery and Analysis of Afterglows from Poorly Localised GRBs with the Gravitational-wave Optical Transient Observer (GOTO) All-sky Survey
Gamma-ray bursts (GRBs), particularly those detected by wide-field instruments such as the Fermi/GBM, pose a challenge for optical follow-up due to their large initial localisation regions, leaving many GRBs without identified afterglows. The Gravitational-wave Optical Transient Observer (GOTO), with its wide field of view, dual-site coverage, and robotic rapid-response capability, bridges this gap by rapidly identifying and localising afterglows from alerts issued by space-based facilities inc…

Gravitational Wave Spectrum from the Production of Dark Matter via the freeze-in Mechanism
Yonghua Wang, Wei Chao
https://arxiv.org/abs/2508.10665 https://…

Gravitational Wave Spectrum from the Production of Dark Matter via the freeze-in Mechanism
Since the first detection of gravitational waves by ground-based interferometers, it has emerged as a novel probe for exploring physics in the early universe. The particle nature of cold dark matter (DM) and its underlying production mechanisms remain long-standing unresolved issues in the field. Notably, if DM is generated through the freeze-in mechanism in the early universe, direct laboratory detection becomes extraordinarily challenging due to its extremely weak coupling with standard model…

Phase segregation of liquid-vapor systems with a gravitational field
A. Lamura
https://arxiv.org/abs/2510.06399 https://arxiv.org/pdf/2510.06399

Phase segregation of liquid-vapor systems with a gravitational field
Phase separation in the presence of external forces has attracted considerable attention since the initial works for solid mixtures. Despite this, only very few studies are available which address the segregation process of liquid-vapor systems under gravity. We present here an extensive study which takes into account both hydrodynamic and gravitational effects on the coarsening dynamics. An isothermal formulation of a lattice Boltzmann model for a liquid-vapor system with the van…

A Note on the Feynman Lectures on Gravitation
Satoshi Nakajima
https://arxiv.org/abs/2509.11799 https://arxiv.org/pdf/2509.11799

A Note on the Feynman Lectures on Gravitation
Following Feynman's lectures on gravitation, we consider the theory of the gravitational (massless spin-2) field in flat spacetime and present the third- and fourth-order Lagrangian densities for the gravitational field. In particular, we present detailed calculations for the third-order Lagrangian density.

Mapping the Gravitational-wave Background Across the Spectrum with a Next-Generation Anisotropic Per-frequency Optimal Statistic
Kyle A. Gersbach, Stephen R. Taylor, Bence B\'ecsy, Anna-Malin Lemke, Andrea Mitridate, Nihan Pol
https://arxiv.org/abs/2509.07090

Mapping the Gravitational-wave Background Across the Spectrum with a Next-Generation Anisotropic Per-frequency Optimal Statistic
With pulsar timing arrays (PTAs) having observed a gravitational wave background (GWB) at nanohertz frequencies, the focus of the field is shifting towards determining and characterizing its origin. While the primary candidate is a population of GW-emitting supermassive black hole binaries (SMBHBs), many other cosmological processes could produce a GWB with similar spectral properties as have been measured. One key argument to help differentiate an SMBHB GWB from a cosmologically sourced one is…

Quantum Computing Tools for Fast Detection of Gravitational Waves in the Context of LISA Space Mission
Maria-Catalina Isfan, Laurentiu-Ioan Caramete, Ana Caramete, Daniel Tonoiu, Alexandru Nicolin-Zaczek
https://arxiv.org/abs/2509.12929

Quantum Computing Tools for Fast Detection of Gravitational Waves in the Context of LISA Space Mission
The field of gravitational wave (GW) detection is progressing rapidly, with several next-generation observatories on the horizon, including LISA. GW data is challenging to analyze due to highly variable signals shaped by source properties and the presence of complex noise. These factors emphasize the need for robust, advanced analysis tools. In this context, we have initiated the development of a low-latency GW detection pipeline based on quantum neural networks (QNNs). Previously, we demonstra…

The Impact of Solar-Terrestrial Plasma and Magnetic Field on the Detection of Space-borne Gravitational Wave Detections
Wei Su
https://arxiv.org/abs/2509.16982 https://

The Impact of Solar-Terrestrial Plasma and Magnetic Field on the Detection of Space-borne Gravitational Wave Detections
Space-borne gravitational wave detections raise new questions for heliophysics: how the Sun-Terrestrial space environment affect gravitational wave detection, and to what extent? Space-borne gravitational wave detectors use laser interferometry to measure displacement variations between two free test masses caused by gravitational waves. Space-borne gravitational wave detectors require extremely high measurement accuracy, making it necessary to take into account the effects of space plasma and …

Oganesson versus Uranium Hydrogen-like Ions from the Viewpoint of Old Quantum Mechanics
Kamal Barley, Andreas Ruffing, Sergei K. Suslov
https://arxiv.org/abs/2509.06249 https://…

Oganesson versus Uranium Hydrogen-like Ions from the Viewpoint of Old Quantum Mechanics
We compare, within the framework of the old Bohr-Sommerfeld atomic model, Uranium versus hypothetical Oganesson relativistic hydrogen-like ions. Existence of a self-intercepting orbit in the super strong static Coulomb field is demonstrated with the aid of Mathematica computer algebra system. A possibility of a similar 'Oganesson-type' effect in a strong gravitational field is also mentioned.

Global existence of the irrotational Euler-Norstrom equations with a positive cosmological constant: The gravitational field equation
Uwe Brauer, Lavi Karp
https://arxiv.org/abs/2509.02023

Global existence of the irrotational Euler-Norstrom equations with a positive cosmological constant: The gravitational field equation
Our objective is to demonstrate the global existence of classical solutions for the nonlinear irrotational Euler-Nordstroem system, which includes a linear equation of state and a cosmological constant. In this framework, the gravitational field is represented by a single scalar function that satisfies a specific semi-linear wave equation. We focus on spatially periodic deviations from the background metric, which is why we study the semi-linear wave equation on the three-dimensional torus $\ma…

Using gravitational lensing to probe for bright quintessential galaxies in the Epoch of Reionization
Joshua Roberson, Matthew B. Bayliss, M. D. Gladders, Gourav Khullar, Keren Sharon, Keunho Kim, Dan Coe, Lindsey Bleem, Taweewat Somboonpanyakul
https://arxiv.org/abs/2510.12097

Using gravitational lensing to probe for bright quintessential galaxies in the Epoch of Reionization
Understanding the properties of the first generation of galaxies is an ongoing challenge in observational astrophysics. While advances in deep field observation have led to the identification of large numbers of galaxies within the Epoch of Reionization, there are very few observed galaxies at this range that are sufficiently bright for high signal-to-noise spectroscopy. To this end, we analyse HST and ground-based photometry of five candidate strongly lensed galaxies, all projected behind the …

Decoding the string in terms of holographic quantum maps
Avik Chakraborty, Tanay Kibe, Mart\'in Molina, Ayan Mukhopadhyay, Hardik Vamshi
https://arxiv.org/abs/2509.13404 htt…

Decoding the string in terms of holographic quantum maps
It has recently been shown that the Nambu-Goto equation for a string emerges from the junction conditions in three-dimensional gravity. Holographically, gravitational junctions are dual to interfaces in conformal field theory. We demonstrate that each stringy mode of the junction corresponds to a universal $\mathcal{H}_{in}\rightarrow \mathcal{H}_{out}$ quantum map between in and out Hilbert spaces of excitations scattered at the interface, and also a universal $\mathcal{H}_{L}\rightarrow \math…

Oscillations and parity violation in gravitational wave background from extra tensor modes
Jaume Garriga, Mohammad Ali Gorji, Fazlollah Hajkarim, Misao Sasaki
https://arxiv.org/abs/2508.08481

Oscillations and parity violation in gravitational wave background from extra tensor modes
Spectator fields which provide additional tensor degrees of freedom, on top of the standard metric tensor perturbations, can produce significant amounts of gravitational waves (GWs). Employing the effective field theory approach for spin-2 fields, we find a universal prediction that linear mixing between the metric and extra tensor modes inevitably induces oscillatory features in the GW spectrum, reminiscent of the so-called neutrino oscillation. Moreover, parity-violating operators in the spin…

Gravitational collapse with torsion and universe in a black hole
Nikodem Pop{\l}awski
https://arxiv.org/abs/2509.11468 https://arxiv.org/pdf/2509.11468

Gravitational collapse with torsion and universe in a black hole
We consider gravitational collapse of a fluid sphere with torsion generated by spin, which forms a black hole. We use the Tolman metric and the Einstein$-$Cartan field equations with a relativistic spin fluid as a source. We show that gravitational repulsion of torsion prevents a singularity, replacing it with a nonsingular bounce. Quantum particle creation during contraction prevents shear from overcoming torsion. Particle creation during expansion can generate a finite period of inflation and…

Magnetic effects on fundamental modes in rotating neutron stars with a purely toroidal magnetic field
Anson Ka Long Yip, Tjonnie Guang Feng Li
https://arxiv.org/abs/2509.10150 h…

Magnetic effects on fundamental modes in rotating neutron stars with a purely toroidal magnetic field
Electromagnetic and gravitational-wave signals from neutron stars are shaped by rapid rotation and strong magnetic fields. Determining these properties is essential to interpret such signals, but current measurements are limited: rotation estimates rely on electromagnetic detections and assume uniform rotation, while inferring interior magnetic fields remains ambiguous due to a lack of direct observations. Measuring the excited fundamental modes of neutron stars in gravitational-wave signals of…

Series D, Episode 09 - Sand
CHASGO: Suddenly, I think we must have hit some kind of multi-gravitational field. Instruments are going mad. Investigator, you and the others better get strapped in. S'gonna be a hell of a bumpy ride down.
[In Xenon Base, Vila slams his glass down on the table in front of him.]
https://blake.torp…

On the (Im)possibility of Electrically Charged Planck Relics
Stefano Profumo
https://arxiv.org/abs/2509.12520 https://arxiv.org/pdf/2509.12520

On the (Im)possibility of Electrically Charged Planck Relics
I revisit whether black-hole remnants, from sub-Planckian compact objects to Planck relics and up to (super)massive black holes, can preserve Standard-Model (SM) electric charge. Two exterior-field mechanisms -- Coulomb-focused capture from ambient media and QED Schwinger pair production -- robustly neutralize such objects across cosmic history. I first derive the general capture rate including both Coulomb and gravitational focusing, and sum the stepwise discharge time in closed form via the t…

Performance of Machine Learning Methods for Gravity Inversion: Successes and Challenges
Vahid Negahdari, Shirin Samadi Bahrami, Seyed Reza Moghadasi, Mohammad Reza Razvan
https://arxiv.org/abs/2510.09632

Performance of Machine Learning Methods for Gravity Inversion: Successes and Challenges
Gravity inversion is the problem of estimating subsurface density distributions from observed gravitational field data. We consider the two-dimensional (2D) case, in which recovering density models from one-dimensional (1D) measurements leads to an underdetermined system with substantially more model parameters than measurements, making the inversion ill-posed and non-unique. Recent advances in machine learning have motivated data-driven approaches for gravity inversion. We first design a convo…

Gravitational four-derivative corrections in non-relativistic heterotic supergravity and the $SO(8)$ Green-Schwarz mechanism
Eric Lescano
https://arxiv.org/abs/2508.09250 https:…

Gravitational four-derivative corrections in non-relativistic heterotic supergravity and the $SO(8)$ Green-Schwarz mechanism
We present the first explicit construction of the four-derivative gravitational corrections to heterotic supergravity in the non-relativistic (NR) limit. By extending the Bergshoeff-de Roo identification to NR backgrounds, we obtain a finite higher-derivative completion of the NR heterotic action and determine its full set of symmetry transformations. A key outcome is the emergence of a gravitational $SO(8)$ Green-Schwarz mechanism from the NR gauge transformation of the Kalb-Ramond field. This…

Study of Lobster and Kirkpatrick-Baez Designs for a Small Mission dedicated to Gravitational Wave Transient Localization
John Rankin, Sergio Campana, Giovanni Pareschi, Daniele Spiga, Stefano Basso, Marta Maria Civitani, Paolo Conconi, Vincenzo Cotroneo
https://arxiv.org/abs/2510.05002

Study of Lobster and Kirkpatrick-Baez Designs for a Small Mission dedicated to Gravitational Wave Transient Localization
The localization of X-ray counterparts to gravitational wave events requires a telescope with accurate localization capability in a field of view comparable to the region constrained by the gravitational wave detectors. In the context of a small, dedicated, mission, we investigate which optical design could satisfy this capability. We compare the possible optical designs that have been proposed for X-rays: the Lobster Eye design (both in the Angel and Schmidt variant) - inspired by the eyes of …

The fundamental physical importance of generic off-diagonal solutions and Grigori Perelman entropy in the Einstein gravity theory
Sergiu I. Vacaru, El\c{s}en V. Veliev
https://arxiv.org/abs/2508.10939 …

The fundamental physical importance of generic off-diagonal solutions and Grigori Perelman entropy in the Einstein gravity theory
The gravitational field equations in general relativity (GR) consist of a sophisticated system of nonlinear partial differential equations. Solving such equations in some generic off-diagonal forms is usually a hard analytic or numeric task. Physically important solutions in GR were constructed using a diagonal ansatz for metrics with a maximum of 4 independent coefficients. The Einstein equations can be solved in exact or parametric forms determined by some integration constants for correspond…

Particle physics models of interacting bosonic dark energy and fermionic dark matter in Einstein scalar Gauss-Bonnet gravity
Simran Arora, Saddam Hussain, Benjamin Rose, Anzhong Wang
https://arxiv.org/abs/2508.08638

Particle physics models of interacting bosonic dark energy and fermionic dark matter in Einstein scalar Gauss-Bonnet gravity
We explore a cosmological framework in which a Gauss-Bonnet (GB) coupled scalar field, acting as dark energy, interacts with a fermionic dark matter field through a coupling obtained from the point of view of particle physics. This setup is inspired by string/M-theory, and two representative scalar field potentials are investigated: exponential and power-law. A distinctive feature of the GB-coupled models is their potential to alter the propagation speed of gravitational waves (GWs), a property…

Potential series expansion method applied in Analytical Modeling of Gravitational field of Irregularly Shaped Celestial Bodies
Marcelo Lisboa Mota, Safwan Aljbaae, Antonio F. B. A. Prado
https://arxiv.org/abs/2507.19433

Potential series expansion method applied in Analytical Modeling of Gravitational field of Irregularly Shaped Celestial Bodies
This study aims to establish an analytical model that reproduces the gravitational field around non-spherical bodies with constant density. Due to the non-spherical geometry of such bodies, their gravitational potential is disturbed relative to a central field. By considering the body as a polyhedron and decomposing it into tetrahedral elements, we use the Series Potential Expansion Method (PSEM) to approximate the total potential by summing the potentials of each tetrahedron. While this model …

Anisotropic Gravitational Waves from Anisotropic Axion Rotation
Arushi Bodas, Keisuke Harigaya, Keisuke Inomata, Takahiro Terada, Lian-Tao Wang
https://arxiv.org/abs/2508.08249 …

Anisotropic Gravitational Waves from Anisotropic Axion Rotation
Gravitational waves (GWs) provide a powerful probe of the early universe due to their ability to free-stream across cosmic history. We study GW production in a compelling scenario where a rotating axion(-like) field becomes relevant for a brief period in the early universe before transitioning into a kination fluid and rapidly dissipating its energy through cosmic expansion. During this short epoch, the curvature perturbation can be predominantly sourced by the rotating axion and may significan…

Can a $\xi R \phi^2$ non-minimal coupling contribute to the non-relativistic gravitational potential?
Avijit Sen Majumder, Sourav Bhattacharya
https://arxiv.org/abs/2508.09523 h…

Can a $ξR ϕ^2$ non-minimal coupling contribute to the non-relativistic gravitational potential?
We investigate the contribution of the $\sqrt{-g}ξRϕ^2$ non-minimal interaction for a massive scalar to the gravitational potential, found via the non-relativistic 2-2 scattering with one and two graviton exchanges up to one loop order. Such coupling can be most naturally motivated from the renormalisation of a scalar field theory with quartic self interaction in a curved spacetime. This coupling is qualitatively different from the minimal ones, like $\sim \sqrt{G} h^{μν}T_{μν}$, as the v…

The Higgs Field Governs the Interior Spacetime of Black Holes
Itzhak Bars
https://arxiv.org/abs/2509.06800 https://arxiv.org/pdf/2509.06800

The Higgs Field Governs the Interior Spacetime of Black Holes
The Higgs field is conventionally treated as a small local perturbation atop a large, constant vacuum value that uniformly permeates the universe. I propose instead that in regions of extreme gravitational intensity -- such as near gravitational singularities -- the Higgs field behaves in a profoundly non-perturbative manner. In such environments, spacetime and the Higgs field engage in a dynamic interplay that extends spacetime beyond the singularity, achieving geodesic completeness. The conti…

The Gravitational Wave Memory from Binary Neutron Star Mergers
Jamie Bamber, Antonios Tsokaros, Milton Ruiz, Stuart L. Shapiro, Marc Favata, Matthew Karlson, Fabrizio Venturi Pi\~nas
https://arxiv.org/abs/2510.09742

The Gravitational Wave Memory from Binary Neutron Star Mergers
The gravitational wave signal produced by the merger of two compact objects includes both an oscillatory transient and a non-oscillatory part, the so-called memory effect. This produces a permanent displacement of test masses and has not yet been measured. We use general relativistic magnetohydrodynamic simulations, including neutrinos, with several representative viable equations of state, to quantify--for the first time--the effects of the neutron star magnetic field, neutrino emission, and t…

Apparent Lorentz violation from disformally coupled ultralight dark matter
Guillem Dom\`enech, Apostolos Tsabodimos, Nathaniel Sherrill, Alexander Ganz, Fiona Kirk
https://arxiv.org/abs/2510.07490

Apparent Lorentz violation from disformally coupled ultralight dark matter
We study the impact of general disformal metric transformations on fermions, which shift the gravitational metric by an additional rank-2 tensor. This tensor can in principle be constructed from scalar-field gradients, vector fields, or field-strength contractions. We show this transformation results in the conventional Dirac action being modified by additional kinetic and axial-current couplings that are quadratic in the shifted field. When the field sourcing the metric shift takes on a non-tr…

Gravitational Waves sourced by Gauge Fields during Inflation
Martin Teuscher, Ruth Durrer, Killian Martineau, Aur\'elien Barrau
https://arxiv.org/abs/2510.00869 https://

Gravitational Waves sourced by Gauge Fields during Inflation
We study the inflationary gravitational wave background induced by Abelian gauge fields generated by non-minimal kinetic and axial couplings to the inflaton. We show that the gravitational wave spectrum is scale invariant and derive its amplitude for generic gauge field coupling parameters, within the slow-roll approximation. We constrain the coupling values and the scale of inflation for which the induced gravitational wave background is observable, while ensuring that back-reaction on the inf…

Gravitational constant as a conserved charge in black hole thermodynamics
Wontae Kim, Mungon Nam
https://arxiv.org/abs/2509.08390 https://arxiv.org/pdf/250…

Gravitational constant as a conserved charge in black hole thermodynamics
Recent work has demonstrated that coupling constants in a given action can be promoted to the role of conserved charges. This is achieved by introducing pairs of field variables constructed from combinations of scalar and gauge fields. This framework naturally suggests that the gravitational constant itself can be interpreted as a conserved charge, arising from an associated gauge symmetry. In a modified four-dimensional Einstein-Hilbert action, we explicitly show that the gravitational constan…

Quantum Dynamics of a Scalar Particle in Schwarzschild Spacetime using the Generalized Feshbach Villars Transformation
Sarra Garah, Abdelmalek Boumali
https://arxiv.org/abs/2509.12506

Quantum Dynamics of a Scalar Particle in Schwarzschild Spacetime using the Generalized Feshbach Villars Transformation
In this work, we apply the generalised Feshbach Villars transformation (GFVT) to spin-0 scalar fields in a Schwarzschild gravitational background. Starting from the covariant Klein Gordon equation, we reformulate the dynamics in the FV two-component representation, which enables a natural separation of positive- and negative-energy branches. In the far-field approximation, the system exhibits a hydrogen like bound spectrum, confirming the ability of GFVT to provide a consistent probabilistic in…

MasconCube: Fast and Accurate Gravity Modeling with an Explicit Representation
Pietro Fanti, Dario Izzo
https://arxiv.org/abs/2509.08607 https://arxiv.org/…

MasconCube: Fast and Accurate Gravity Modeling with an Explicit Representation
The geodesy of irregularly shaped small bodies presents fundamental challenges for gravitational field modeling, particularly as deep space exploration missions increasingly target asteroids and comets. Traditional approaches suffer from critical limitations: spherical harmonics diverge within the Brillouin sphere where spacecraft typically operate, polyhedral models assume unrealistic homogeneous density distributions, and existing machine learning methods like GeodesyNets and Physics-Informed…

On the non-zero Love numbers of magnetic black holes
David Pere\~niguez, Edgars Karnickis
https://arxiv.org/abs/2509.12418 https://arxiv.org/pdf/2509.12418…

On the non-zero Love numbers of magnetic black holes
Black holes are believed to possess vanishing Love numbers, which implies that they do not deform in the presence of external tides. This fact has been verified in a number of scenarios, that involve tides of bosonic fields of various natures (e.g. scalar, electromagnetic and gravitational), and has triggered active research in trying to identify the underlying reason. Surprisingly, two counterexamples have been found recently. The first, concerns charged-field tides on electrically-charged bla…

A New Source of Phase Transition Gravitational Waves: Heavy Particle Braking Across Bubble Walls
Dayun Qiu, Siyu Jiang, Fa Peng Huang
https://arxiv.org/abs/2508.04314 https://…

A New Source of Phase Transition Gravitational Waves: Heavy Particle Braking Across Bubble Walls
We propose a novel mechanism for the generation of microscopic gravitational waves (GWs) during cosmological first-order phase transitions, arising from the braking of heavy particles as they traverse bubble walls. Unlike conventional sources such as bubble collision, sound waves or turbulence in the plasma, this mechanism originates from the direct interaction between massive particles and the expanding bubble wall. We use quantum field theory to rigorously compute the gravitational radiation.…

Adaptive extended Kalman filter and laser link acquisition in the detection of gravitational waves in space
Jinke Yang, Yong Xie, Yidi Fan, Pengcheng Wang, Xindong Liang, Haojie Li, Xue Wang, Zhao Cui, Jianjun Jia, Yucheng Tang, Yun Kau Lau
https://arxiv.org/abs/2508.21538

Adaptive extended Kalman filter and laser link acquisition in the detection of gravitational waves in space
An alternative, new laser link acquisition scheme for the triangular constellation of spacecraft (SCs) in deep space in the detection of gravitational waves is considered. In place of a wide field CCD camera in the initial stage of laser link acquisition adopted in the conventional scheme, an extended Kalman filter based on precision orbit determination is incorporated in the point ahead angle mechanism (PAAM) to steer the laser beam in such a way to narrow the uncertainty cone and at the same …

Gravitostatic black hole Love numbers from Membrane Paradigm at large $D$
Subhajit Mazumdar
https://arxiv.org/abs/2508.07290 https://arxiv.org/pdf/2508.072…

Gravitostatic black hole Love numbers from Membrane Paradigm at large $D$
Black holes, like any other object - respond to external fields like background electric and gravitational fields. At lowest order, the response of a black hole to, (e.g.) a gravitational wave in the $l^{th}$ spherical harmonic mode is to develop a generalized `quadrupole moment' in the same symmetry channel. The induced moment of the black hole is proportional to the external forcing field. The constant of proportionality between the field and the response is a function of the frequency $ω$ o…

Particle creation in a cosmological background in analogy to the Schwinger effect
Walter D. van Suijlekom, Michael F. Wondrak, Heino Falcke
https://arxiv.org/abs/2510.09481 http…

Particle creation in a cosmological background in analogy to the Schwinger effect
We consider a gravitational analogue of the Schwinger effect in a cosmological context. While the Schwinger effect is usually attributed to a static electric background, its derivation is actually based on a switching on/off of the electric field in the infinite past/future. Motivated by this, and our previous work on particle production in a gravitational background, we consider a long pulse of the gravitational field in an FLRW-spacetime, thus simulating a static background. We rigorously der…

$w$-mode oscillation of neutron star in a new relativistic hybrid model
D. Dey, Jeet Amrit Pattnaik, R. N. Panda, S. K. Patra
https://arxiv.org/abs/2509.01175 https://

$w$-mode oscillation of neutron star in a new relativistic hybrid model
We investigate how the pulsation frequencies of axial gravitational-wave modes ($w$-modes) in a non-rotating neutron star depend on its composition, particularly when including quarkyonic matter and fermionic dark matter. These modes emerge from the coupling between the star's fluid component and the gravitational field of general relativity, which are highly damped and characterized by complex frequencies with comparable real and imaginary parts. Using a relativistic mean field formalism for t…

Cosmology in the Hoyle Narlikar gravity
J. K. Singh, Sonal Aggarwal, Shaily, Hamid Shabani
https://arxiv.org/abs/2510.11762 https://arxiv.org/pdf/2510.117…

Cosmology in the Hoyle Narlikar gravity
In this paper, we study the late time cosmic acceleration of the Quintessence model within the framework of Hoyle Narlikar Gravity, consisting of a creation field. Using the Hubble tension as a function of the density parameter for matter, the density parameter for radiation, and the density parameter for dark energy in the covariant formulation, we find the gravitational field equations in the spatially flat, homogeneous, and isotropic spacetime to examine the dynamical mechanism that leads to…

Dark Energy Survey Year 6 Results: Redshift Calibration of the MagLim Lens Sample
G. Giannini, A. Alarcon, W. d'Assignies, G. M. Bernstein, M. A. Troxel, C. Chang, B. Yin, A. Amon, J. Myles, N. Weaverdyck, A. Porredon, D. Anbajagane, S. Avila, K. Bechtol, M. R. Becker, J. Blazek, M. Crocce, D. Gruen, M. Rodriguez-Monroy, C. S\'anchez, D. Sanchez Cid, I. Sevilla-Noarbe, M. Aguena, S. Allam, O. Alves, F. Andrade-Oliveira, D. Bacon, S. Bocquet, D. Brooks, R. Camilleri, A. Carner…

Dark Energy Survey Year 6 Results: Redshift Calibration of the MagLim++ Lens Sample
In this work, we derive and calibrate the redshift distribution of the MagLim++ lens galaxy sample used in the Dark Energy Survey Year 6 (DES Y6) 3x2pt cosmology analysis. The 3x2pt analysis combines galaxy clustering from the lens galaxy sample and weak gravitational lensing. The redshift distributions are inferred using the SOMPZ method - a Self-Organizing Map framework that combines deep-field multi-band photometry, wide-field data, and a synthetic source injection (Balrog) catalog. Key impr…

The effects of the Gravitational Field on the Efimov State
Yixuan Feng
https://arxiv.org/abs/2509.05575 https://arxiv.org/pdf/2509.05575

The effects of the Gravitational Field on the Efimov State
We successfully reproduced the derivation of Efimov energy levels in three-dimensional space. In subsequent discussions, we extended this derivation to Schwarzschild spacetime. By combining the Schrödinger equation in curved spacetime, we obtained the corrections to the Efimov energy spectrum under weak gravitational fields. Furthermore, using Riemann normal coordinate expansions, we rigorously derived the hyperradial equation in the presence of strong gravitational fields and applied first-or…

Gamma-Rays and Gravitational Waves from Inelastic Higgs Portal Dark Matter
Dan Hooper, Gordan Krnjaic, Duncan Rocha, Subhojit Roy
https://arxiv.org/abs/2507.22975 https://

Gamma-Rays and Gravitational Waves from Inelastic Higgs Portal Dark Matter
We explore a simple and predictive dark matter scenario involving a complex scalar field, $ϕ$, coupled to the Higgs portal with no additional field content. In the UV, the field possesses a global $U(1)$ symmetry which is broken by mass terms and Higgs portal interactions. In the mass basis, the complex field splits into a pair of real scalars with a small mass splitting (in analogy to pseudo-Dirac fermions), such that the Higgs portal acquires both diagonal and off-diagonal terms with respect…

Parallel Nested Slice Sampling for Gravitational Wave Parameter Estimation
David Yallup, Metha Prathaban, James Alvey, Will Handley
https://arxiv.org/abs/2509.24949 https://

Parallel Nested Slice Sampling for Gravitational Wave Parameter Estimation
Inferring parameters and testing hypotheses from gravitational wave signals is a computationally intensive task central to modern astrophysics. Nested sampling, a Bayesian inference technique, has become an established standard for this in the field. However, most common implementations lack the ability to fully utilize modern hardware acceleration. In this work, we demonstrate that when nested sampling is reformulated in a natively vectorized form and run on modern GPU hardware, we can perform…

Deep-Field Analytical Calibration
Andy Park, Xiangchong Li, Rachel Mandelbaum, Matthew Becker
https://arxiv.org/abs/2509.05152 https://arxiv.org/pdf/2509.0…

Deep-Field Analytical Calibration
The next generation of imaging surveys, including the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), Euclid, and the Nancy Grace Roman Space Telescope, will place unprecedented constraints on cosmology using weak gravitational lensing. To fully exploit their statistical power, shear measurement methods must achieve sub-percent accuracy while mitigating systematic biases from noise, the point-spread function (PSF), blending, and shear-dependent detection. The analytical calibr…

Chaos of charged particles near a renormalized group improved Kerr black hole in an external magnetic field
Junjie Lu, Xin Wu
https://arxiv.org/abs/2510.08954 https://

Chaos of charged particles near a renormalized group improved Kerr black hole in an external magnetic field
In a quantum theory of gravity, a renormalization group improved Kerr metric is obtained from the Kerr metric, where the Newton gravitational constant is modified as a function of the radial distance. The motion of neutral test particles in this metric is integrable. However, the dynamics of charged test particles is nonintegrable when an external asymptotically homogeneous magnetic field exists in the vicinity of the black hole. The transition from regular dynamics to chaotic dynamics is numer…

Impact of Non-Thermal Leptogenesis from Early Matter Domination on Gravitational Wave from FOPT
Dilip Kumar Ghosh, Anish Ghoshal, Koustav Mukherjee, Nimmala Narendra, Nobuchika Okada
https://arxiv.org/abs/2508.02619

Impact of Non-Thermal Leptogenesis from Early Matter Domination on Gravitational Wave from FOPT
We study the impact of non-thermal leptogenesis on the spectrum of gravitational waves (GWs) produced by a strong first-order phase transition in the early Universe. We consider a scenario in which a heavy scalar field, $ϕ$, dominates the energy density of the early Universe and decays into heavy right-handed neutrinos (RHNs). The subsequent decay of RHNs generates a lepton asymmetry, which is partially converted into the observed baryon asymmetry via the sphaleron process. The $ϕ$-dominated …

Integrated effect of the cosmic space magnetic field on the acceleration noise of the TQ gravitational wave detection program
Cheng-Long Yu, Jin Yan, Lin Ji, Wen-Ke Shi, Yi Zhang, Run-Qiu Liu, Hong-Qing Huo
https://arxiv.org/abs/2509.03562

Integrated effect of the cosmic space magnetic field on the acceleration noise of the TQ gravitational wave detection program
The TianQin(TQ) program is to deploy three satellites that can form an equilateral triangle in about 100,000 km Earth orbit to capture gravitational wave signals in the low-frequency band. In order to ensure accurate capture, noise needs to be analyzed and compensated. In this paper, we model and analyze the acceleration noise generated by the test mass affected by the magnetic field in space. In this paper, we use the Tsyganenko model as the background magnetic field of the TQ orbit, calculate…

General Relativity in IIB Matrix Model
Pei-Ming Ho, Hikaru Kawai, Harold C. Steinacker
https://arxiv.org/abs/2509.06646 https://arxiv.org/pdf/2509.06646

General Relativity in IIB Matrix Model
The matrix models are non-perturbative formulations of string theory, from which many believe that spacetime arises. The matrix fluctuations around the spacetime thus created should represent both matter and gravitational fields. In this paper, we discuss how the gravitational field emerges from the IIB matrix model. In particular, we consider how diffeomorphism invariance arises and how unitarity is guaranteed in this theory. Specifically, we consider matrices as bilocal fields and discuss how…

Horizon tracking for asynchronous parallel black hole simulations
Kyle C. Nelli, William Throwe, Nils Deppe, Mark A. Scheel, Lawrence E. Kidder, Nils L. Vu, Saul A. Teukolsky
https://arxiv.org/abs/2508.08408

Horizon tracking for asynchronous parallel black hole simulations
In the field of gravitational wave science, next-generation detectors will be substantially more accurate than the current suite of detectors. Numerical relativity simulations of binary black hole (BBH) gravitational waveforms must become faster, more efficient, and more accurate to be used in analyses of these next-generation detections. One approach, which the \texttt{SpECTRE} code employs, is using spectral methods for accuracy along with synchronous task-based parallelism to avoid idle time…

The degeneracy between microlensing wave effect and precession in strongly lensed gravitational wave
Xikai Shan, Huan Yang, Shude Mao, Otto A. Hannuksela
https://arxiv.org/abs/2508.21262

The degeneracy between microlensing wave effect and precession in strongly lensed gravitational wave
Microlensing induced by the stellar field within a strong lensing galaxy can introduce fluctuations in the waveforms of strongly-lensed gravitational waves.When fitting these signals with templates that do not account for microlensing,possible degeneracies can lead to false evidence of certain intrinsic parameters,resulting in a misinterpretation of the properties of the underlying system.For example,the wave effect of microlensing may mimic spin precessions,as both effects generically induce p…

Non-linear sigma model in string field theory
Alexander Frenkel, Manki Kim
https://arxiv.org/abs/2509.20527 https://arxiv.org/pdf/2509.20527

Non-linear sigma model in string field theory
We revisit the non-linear sigma model approach to string theory with the closed superstring field theory. We construct the string field theory around the non-linear sigma model background with the patch-by-patch description. We show that our string field theory action is invariant under the gauge transformation and solves the BV master equation, thereby providing a tool to study quantum gravitational effects in curved backgrounds in small $α'$ and $g_s$ approximation. We illustrate how to use …

Exact solution of the DeWitt-Brehme-Hobbs equation in copropagating electromagetic and gravitational waves
Giulio Audagnotto, Antonino Di Piazza
https://arxiv.org/abs/2509.07052

Exact solution of the DeWitt-Brehme-Hobbs equation in copropagating electromagetic and gravitational waves
An accelerated charge interacts with itself through the electromagnetic field that it sources, a phenomenon known as electromagnetic radiation reaction. The DeWitt-Brehme-Hobbs (DWBH) equation describes the motion of a charged mass in the presence of combined electromagnetic and gravitational fields, taking into account electromagnetic radiation-reaction effects. Here, we find the first exact analytical solution of the DWBH equation in the case of a charged mass in the presence of copropagating…

Nonlocal effective field theory and its applications
P. Wang, Zhengyang Gao, Fangcheng He, Chueng-Ryong Ji, W. Melnitchouk, Y. Salamu
https://arxiv.org/abs/2509.25657 https://…

Nonlocal effective field theory and its applications
We review recent applications of nonlocal effective field theory, focusing in particular on nonlocal chiral effective theory and nonlocal quantum electrodynamics (QED), as well as an extension of nonlocal effective theory to curved spacetime. For the chiral effective theory, we discuss the calculation of generalized parton distributions (GPDs) of the nucleon at nonzero skewness, along with the corresponding gravitational (or mechanical) form factors, within the convolution framework. In the QED…

Enhancing Multiplet Alignment Measurements with Imaging
Alexus Annika Kumwembe, Claire Lamman, Daniel Eisenstein, Jessica Nicole Aguilar, Steven Ahlen, Davide Bianchi, David Brooks, Todd Claybaugh, Andrei Cuceu, Axel de la Macorra, Biprateep Dey, Peter Doel, Andreu Font-Ribera, Jaime E. Forero-Romero, Enrique Gaztanaga, Satya Gontcho A Gontcho, Gaston Gutierrez, Mustapha Ishak, Jorge Jimenez, Dick Joyce, Robert Kehoe, Theodore Kisner, Ofer Lahav, Martin Landriau, Marc Manera, Ramon Miq…

Enhancing Multiplet Alignment Measurements with Imaging
We demonstrate that measurements of the gravitational tidal field made with spectroscopic redshifts can be improved with information from imaging surveys. The average orientation of small groups of galaxies, or "multiplets" is correlated with large-scale structure and is used to measure the direction of tidal forces. Previously, multiplet intrinsic alignment has been measured in DESI using galaxies that have spectroscopic redshifts. The DESI Legacy Imaging catalog can be used to supplement mult…

A Critical Point on the Hairy Black Hole Phase Boundary in the Improved Holographic Einstein-Maxwell-Dilaton Theory
Hong Guo, Wei-Liang Qian, Bean Wang
https://arxiv.org/abs/2509.03947

A Critical Point on the Hairy Black Hole Phase Boundary in the Improved Holographic Einstein-Maxwell-Dilaton Theory
In this work, we investigate the hairy black hole solutions and their dual phase diagram in the improved holographic Einstein-Maxwell-Dilaton (EMD) model.From the gravitational perspective, the rich phase structures observed in the dual boundary field theory originate from the intricate interplay between the scalar field formalism and the Maxwell field coupling mechanism. Two distinct types of hairy black hole solutions are found in this framework. Type-I hairy black holes are predominantly gov…

Scattering of massive neutrino test fields from a gravitational pulse
Tekin Dereli, Yorgo Senikoglu
https://arxiv.org/abs/2510.04687 https://arxiv.org/pdf/…

Scattering of massive neutrino test fields from a gravitational pulse
Linearized Einstein-Weyl equations are solved precisely in the context of sandwich gravitational waves. The neutrino's energy-momentum depends on the geometry and composition of the gravitational pulse when it is scattered. Since the background remains unchanged at the test field level, the neutrino's energy density will exhibit fluctuations between positive and negative extremes when traversing the sandwich wave. These variations could provide insights into the behavior of models concerning ne…

Bounding field excursions along null geodesics with applications to cosmology
Aidan Herderschee, Aron C. Wall
https://arxiv.org/abs/2510.01554 https://arxi…

Bounding field excursions along null geodesics with applications to cosmology
Scalar fields in theories of gravity often inhabit a moduli space of vacua, and coherent spatial or temporal variations in their expectation values can produce measurable gravitational effects. Such variations are expected in contexts ranging from inflationary cosmology to the near-horizon regions of near-extremal black holes, where they can deflect light rays and shift horizons. This work derives a quantitative field excursion bound (FEB) on scalar variations along null geodesics, expressed in…

Can One Model Gravitational Nonlinear Memory with Fractional Derivative Operators?
Sercan Kaya, Bayram Tekin
https://arxiv.org/abs/2510.07232 https://arxiv…

Can One Model Gravitational Nonlinear Memory with Fractional Derivative Operators?
We investigate whether fractional calculus, with its intrinsic long-tailed memory and nonlocal features, can provide a viable model for gravitational-wave memory effects. We consider two toy constructions: ($i$) a fractional modification of the linearized Einstein field equations using a sequential Caputo operator, and ($ii$) a fractionalized quadrupole formula where the source moment is acted upon by the same operator. Both constructions yield history-dependent responses with small memory-like…

Probing Scalar-Mediated Sterile Neutrinos with Gravitational Wave and Colliders Signals
Qi Bi, Jinhui Guo, Jian Liao, Jia Liu, Xiao-Ping Wang
https://arxiv.org/abs/2509.23925 ht…

Probing Scalar-Mediated Sterile Neutrinos with Gravitational Wave and Colliders Signals
We propose a UV-complete extension of the Standard Model in which a gauge-singlet scalar $S$ acquires a vacuum expectation value, generates a Majorana mass for a sterile neutrino $N$, and mixes with the Higgs field. This framework addresses neutrino masses via a seesaw mechanism and, for sufficiently large scalar mixing, can also drive a strong first-order electroweak phase transition, producing gravitational-wave (GW) signals potentially detectable by GW observatories. The Higgs-$S$ mixing als…

The Influence of Uniform Magnetic Fields on Strong Field Gravitational Lensing by Kerr Black Holes
Amnish Vachher, Arun Kumar, Sushant G. Ghosh
https://arxiv.org/abs/2508.21100 …

The Influence of Uniform Magnetic Fields on Strong Field Gravitational Lensing by Kerr Black Holes
We investigate strong gravitational lensing using magnetized Kerr black holes (MKBHs), which are accurate Kerr-Bertotti-Robinson solutions for Kerr black holes in a uniform magnetic field with additional magnetic field strength $B$ apart from mass $M$ and spin $a$. Unlike previous magnetized spacetimes, the MKBH geometry is Petrov type D, devoid of conical singularities, allowing photons to reach asymptotic infinity and making the concept astrophysically feasible. We use the strong deflection l…

Emergent classical gravity as stress-tensor deformed field theories
Yun-Ze Li, Yunfei Xie, Song He
https://arxiv.org/abs/2508.15461 https://arxiv.org/pdf/2…

Emergent classical gravity as stress-tensor deformed field theories
We introduce a framework in which classical gravity arises from stress-tensor deformations of quantum field theories (QFTs). By expressing the deformed partition function as a gravitational path integral, we propose an equivalent description between a seed QFT coupled to gravity and an effective field theory defined on a deformation-induced metric. This approach, which does not rely on holography or extra dimensions, applies to a variety of gravitational models, including Einstein and Palatini …

Gravitational Lensing and Topological Photon Sphere of Holonomy Corrected Schwarzschild Black Hole with a Cloud of Strings
Faizuddin Ahmed, Shubham Kala
https://arxiv.org/abs/2509.07686

Gravitational Lensing and Topological Photon Sphere of Holonomy Corrected Schwarzschild Black Hole with a Cloud of Strings
In this paper, we theoretically investigate the deflection of light, lensing equations, topological properties of photon rings, and accretion disk characteristics in the spacetime of a holonomy-corrected Schwarzschild black hole surrounded by a cloud of strings. The analysis is carried out in the weak-field limit, where we analytically derive expressions for the deflection angle and extract the corresponding lensing observables. These results reveal the dependence of light deflection on the str…

An innovative black hole solution and thermodynamic properties in higher-order curvature gravity with a scalar field
G. G. L. Nashed, Usman Zafar, Kazuharu Bamba
https://arxiv.org/abs/2509.02643

An innovative black hole solution and thermodynamic properties in higher-order curvature gravity with a scalar field
A spherically symmetric black hole solution defined by the gravitational mass is explored in higher-order curvature gravity associated with a scalar field. It is demonstrated that the singularities of the curvature invariants will be far weaker around the central region of the black hole than those in general relativity, owing to the effect originating from higher-order curvatures with the coupling to a dynamical scalar field. Furthermore, thermodynamic properties and the Davies-type phase tran…

Stationary Solution to Charged Hairy Black Hole in AdS4: Kasner Interior, Rotating Shock Waves, and Fast Scrambling
Hadyan Luthfan Prihadi, Rafi Rizqy Firdaus, Fitria Khairunnisa, Donny Dwiputra, Freddy Permana Zen
https://arxiv.org/abs/2508.02174

Stationary Solution to Charged Hairy Black Hole in AdS4: Kasner Interior, Rotating Shock Waves, and Fast Scrambling
We consider a stationary solution of a charged black hole with scalar hair in AdS$_4$, where the scalar field is coupled to a $U(1)$ Maxwell gauge field. Near the singularity, the spacetime transitions into a more general Kasner geometry. The black hole is then injected with rotating and charged gravitational shock waves in the Dray-'t Hooft solution. These shock waves lengthen the wormhole connecting the two asymptotic boundaries, thereby disrupting the correlations between them. The correlati…

Field theory vacuum and entropic dark energy models
Michael Maziashvili
https://arxiv.org/abs/2507.22093 https://arxiv.org/pdf/2507.22093

Field theory vacuum and entropic dark energy models
We investigate the cosmological implications of a novel definition of field theory vacuum energy. The free field Hamiltonian represented as an ensemble of oscillators (in the Fourier space) usually implies the presence of mass scale for these oscillators, which in quantum field theory is of little importance since quantum energy spectrum of oscillator is mass independent. This mass scale, however, may be interesting due to its possible gravitational implications. Since black hole physics puts a…

Impact of quantum gravity on the UV sensitivity of extremal black holes
Francesco Del Porro, Francesco Ferrarin, Alessia Platania
https://arxiv.org/abs/2509.07058 https://

Impact of quantum gravity on the UV sensitivity of extremal black holes
Recent work has revealed that extremal Kerr black holes may exhibit a sensitivity to higher-derivative corrections to Einstein's equations, displaying singularities in the tidal forces at the horizon. However, in a purely gravitational context, this "ultraviolet sensitivity" translates into a strong dependence on the Wilson coefficients in the low-energy effective field theory. These, in turn, are fixed by the underlying theory of quantum gravity in the ultraviolet. We find a prediction for the…

Testing black hole metrics with binary black hole inspirals
Zhe Zhao, Swarnim Shashank, Debtroy Das, Cosimo Bambi
https://arxiv.org/abs/2510.04703 https://…

Testing black hole metrics with binary black hole inspirals
Gravitational wave astronomy has opened an unprecedented window onto tests of gravity and fundamental physics in the strong-field regime. In this study, we examine a series of well-motivated deviations from the classical Kerr solution of General Relativity and employ gravitational wave data to place constraints on possible deviations from the Kerr geometry. The method involves calculating the phase of gravitational waves using the effective one-body formalism and then applying the parameterized…

The holographic $\TTbar$ deformation of the CFT$_2$ with gravitational anomalies
Debarshi Basu, Qiang Wen, Mingshuai Xu
https://arxiv.org/abs/2507.20292 https://

The holographic $\TTbar$ deformation of the CFT$_2$ with gravitational anomalies
We develop the holographic framework for the $\TTbar$ deformation of two-dimensional conformal field theories (CFT$_2$) with gravitational anomalies, characterized by unequal left and right central charges and holographically dual to topological massive gravity (TMG). Utilizing the mixed boundary condition prescription, we construct the deformed BTZ black hole geometry and derive the corresponding deformed energy spectrum, confirming that the universal flow equation remains valid despite the pr…

Neural Post-Einsteinian Test of General Relativity with the Third Gravitational-Wave Transient Catalog
Yiqi Xie, Gautham Narayan, Nicol\'as Yunes
https://arxiv.org/abs/2510.02515

Neural Post-Einsteinian Test of General Relativity with the Third Gravitational-Wave Transient Catalog
Gravitational waves (GWs) from compact binaries are excellent probes of gravity in the strong- and dynamical-field regime. We report a test of general relativity (GR) with the third GW Transient Catalog (GWTC-3) using the recently developed neural post-Einsteinian framework, both on individual events and at the population level through hierarchical modeling. We find no significant violation of GR and place a constraint that, for the first time, efficiently covers non-GR theories characterized b…

Master field equations for spherically symmetric gravitational fields beyond general relativity
Ra\'ul Carballo-Rubio
https://arxiv.org/abs/2507.15920 …

Master field equations for spherically symmetric gravitational fields beyond general relativity
I construct a set of master field equations encompassing all possible second-order field equations for spherically symmetric spacetimes beyond general relativity. The structure of 2-dimensional Horndeski theory is leveraged to define a spherically symmetric gravitational tensor that is identically conserved and can play an equivalent role as the Einstein tensor in the coupling to spherically symmetric stress-energy tensors. The master field equations provide a framework in which to study a wide…

Building an AdS/BCFT Josephson junction within Horndeski gravity
Fabiano F. Santos, Henrique Boschi-Filho
https://arxiv.org/abs/2510.07165 https://arxiv.or…

Building an AdS/BCFT Josephson junction within Horndeski gravity
This work explores the constriction and normal Josephson junctions of superconductors within Horndeski's gravitational theory framework. Through a single scalar field of this theory, we provide a dual holographic description via the AdS/BCFT correspondence. We identify a critical temperature below which a charged condensate forms through a second-order phase transition in constriction and normal junctions. Our findings reveal that the condensate comprises pairs of quasiparticles. The junctions …

The shadow and quasinormal modes of the asymptotically flat hairy black holes with a dilaton potential
Sheng-Han Xiong, Yong-Zhuang Li, Xiao-Mei Kuang, Jerzy Matyjasek
https://arxiv.org/abs/2508.03270 …

The shadow and quasinormal modes of the asymptotically flat hairy black holes with a dilaton potential
In this article, the shadow and the quasinormal modes (QNMs) of an exact asymptotically flat hairy electrically charged black hole solution with a dilaton potential are investigated. Using the {constraint} equation among the integration constant $η$ of the gravitational field, the mass $M$, the electric charge $Q$ and the coupling constant $ν$ between the $U(1)$ field and the dilaton field, we find that the shadow radii, the Lyapunov exponent $λ$ and the coordinate angular velocity $Ω_{c}$ …

Phase structure of a holographic topological superconductor beyond the probe limit
Hoang Van Quyet
https://arxiv.org/abs/2510.05941 https://arxiv.org/pdf/2…

Phase structure of a holographic topological superconductor beyond the probe limit
We investigate tricritical phase transitions in a holographic model of topological superconductivity using Einstein-Maxwell gravity coupled with a charged scalar field in Anti-de Sitter spacetime. By incorporating both gravitational backreaction and quartic self-interaction $V(ϕ) = λϕ^4$, we demonstrate that the system exhibits both second-order and first-order phase transitions separated by a tricritical point at $(q_{\mathrm{tri}},T_{\mathrm{tri}})=(2.00\pm0.02,0.1521\pm0.0003)$ in the $(q…

Strong gravitational lensing by compact objects with magnetic dipole
Jin Young Kim
https://arxiv.org/abs/2509.01040 https://arxiv.org/pdf/2509.01040…

Strong gravitational lensing by compact objects with magnetic dipole
Compact objects with magnetic dipole are considered as gravitational lenses. The presence of strong magnetic field near the photon sphere can affect the trajectory of light. We compute the deflection angle near the photon sphere on the equatorial plane of the magnetic dipole. In the Einstein-Maxwell gravity we use the asymptotic metric when a massive object has a magnetic dipole moment. In the Einstein-Born-Infeld gravity we use the effective metric accomodating the nonlinear electrodynamic eff…

Thermodynamics of Einstein-Geometric Proca AdS compact objects
Asalkhon Alimova, Elham Ghorani, Beyhan Puli\c{c}e, Farruh Atamurotov, Ahmadjon Abdujabbarov
https://arxiv.org/abs/2509.09389

Thermodynamics of Einstein-Geometric Proca AdS compact objects
In this study we explore metric-Palatini gravity extended by the antisymmetric component of the affine curvature. This gravitational theory results in general relativity plus a geometric Proca field. Building on our previous work, where we constructed its static spherically symmetric solutions in the Anti-de Sitter (AdS) background (Eur. Phys. J. C 83(4):318, 2023), we conduct a comprehensive analysis of the system's thermodynamics. We examine the thermodynamic properties of the Einstein-Geomet…

Gravitational Memory in Generalized Proca Gravity
Lavinia Heisenberg, Benedetta Rosatello, Guangzi Xu, Jann Zosso
https://arxiv.org/abs/2508.20545 https://…

Gravitational Memory in Generalized Proca Gravity
We investigate the gravitational memory effect in the full Generalized Proca gravity, the most general metric theory including a gravitational Proca field with derivative self-interactions that still maintains second-order equations of motion. Building on our previous works on memory in other massless and massive metric theories, we extend a unified framework for computing displacement memory and apply it to Generalized Proca gravity. We identify two non-trivial physically distinct classes of b…

Echoes of bimodal axial gravitational perturbations in a uniform-density star in Einstein-{\AE}ther gravity
Kai Lin, Wei-Liang Qian, Alan B. Pavan, Amilcar Rabelo de Queiroz, Elcio Abdalla
https://arxiv.org/abs/2507.21321

Echoes of bimodal axial gravitational perturbations in a uniform-density star in Einstein-Æther gravity
This paper studies axial gravitational perturbations of a uniform-density star in scalar-Einstein-Æther theory. By applying the Israel junction conditions explicitly in the presence of a scalar field minimally coupled to the gravitational sector, it is shown that a nontrivial scalar profile cannot be sustained, as it induces a divergence at the stellar center. Since analytical solutions are unattainable, the background metric is determined through numerical integration for a few representative…

Quantum Interferometry in External Gravitational Fields
Thomas B. Mieling, Thomas Morling, Christopher Hilweg, Philip Walther
https://arxiv.org/abs/2507.21808 https://

Quantum Interferometry in External Gravitational Fields
Current models of quantum interference experiments in external gravitational fields lack a common framework: while matter-wave interferometers are commonly described using the Schrödinger equation with a Newtonian potential, gravitational effects in quantum optics are modeled using either post-Newtonian metrics or highly symmetric exact solutions to Einstein's field equations such as those of Schwarzschild and Kerr. To coherently describe both kinds of experiments, this paper develops a unifie…

A gravitational spin-orbit interaction in Poincar\'e gauge theory
Sebastian Bahamonde, Jorge Gigante Valcarcel
https://arxiv.org/abs/2508.20035 https://

A gravitational spin-orbit interaction in Poincaré gauge theory
We show a gravitational spin-orbit interaction that can potentially modify the space-time geometry naturally emerges in the framework of Poincaré gauge theory. For this purpose, we derive the field equations of a particular model with cubic order invariants and demonstrate the existence of analytical solutions which display an interaction between the intrinsic and extrinsic angular momentum parameters in the gravitational action, in analogy to the spin-orbit interaction arising from atomic and…

Chase Orbits, not Time: A Scalable Paradigm for Long-Duration Eccentric Gravitational-Wave Surrogates
Akash Maurya, Prayush Kumar, Scott E. Field, Chandra Kant Mishra, Peter James Nee, Kaushik Paul, Harald P. Pfeiffer, Adhrit Ravichandran, Vijay Varma
https://arxiv.org/abs/2510.00116

Chase Orbits, not Time: A Scalable Paradigm for Long-Duration Eccentric Gravitational-Wave Surrogates
Surrogate modeling of eccentric binary black hole waveforms has remained challenging. The complicated morphology of these waveforms due to the eccentric orbital timescale variations makes it difficult to construct accurate and efficient surrogate models, especially for waveforms long enough to cover the sensitivity band of the current ground-based gravitational wave detectors. We present a novel and scalable surrogate building technique which makes surrogate modeling of long-duration eccentric …

Decisive Evidence for the First Overtone Mode in the Ringdown Signal of GW231028
Hai-Tian Wang
https://arxiv.org/abs/2509.08657 https://arxiv.org/pdf/2509.…

Decisive Evidence for the First Overtone Mode in the Ringdown Signal of GW231028
The properties of a remnant black hole can be probed by analyzing the gravitational waves emitted during its ringdown phase. This signal provides a direct test of general relativity in the strong-field regime. In this study, we apply a time-domain F-statistic framework to the ringdown of GW231028_153006 and find decisive evidence for the presence of the first overtone mode in the signal. The detection of the $\ell|m|n=221$ mode is statistically significant, achieving a Bayes factor of…

Noncoincidence $f(Q)$-Cosmology with Dark Matter Coupled to Gravity
A. Abebe, P. S. Apostolopoulos, A. Giacomini, G. Leon, F. Moncada, A. Paliathanasis
https://arxiv.org/abs/2510.00535

Noncoincidence $f(Q)$-Cosmology with Dark Matter Coupled to Gravity
We investigate FLRW cosmology in the framework of symmetric teleparallel $f(Q)$ gravity with a nonminimal coupling between dark matter and the gravitational field. In the noncoincidence gauge, the field equations admit an equivalent multi-scalar field representation, which we investigate the phase-space using the Hubble-normalization approach. We classify all stationary points for arbitrary function $f(Q)$ and we discuss the physical properties of the asymptotic solutions. For the power-law the…

Probing scalar field with generic extreme mass-ratio inspirals around Kerr black holes
Tieguang Zi, Shailesh Kumar
https://arxiv.org/abs/2508.00516 https://

Probing scalar field with generic extreme mass-ratio inspirals around Kerr black holes
The future space-based gravitational wave observatories are expected to provide unprecedented opportunities to explore intricate characteristics of black hole binaries, particularly for extreme mass-ratio inspirals (EMRIs), in which a stellar-mass compact object slowly inspirals into a supermassive black hole. These systems are very prominent sources for testing gravity in the strong gravity fields and for probing potential deviations from general relativity, including those arising from the pr…

Axion boson stars with wormhole topology
Chen-Hao Hao, Yong-Qiang Wang, Jieci Wang
https://arxiv.org/abs/2509.19822 https://arxiv.org/pdf/2509.19822…

Axion boson stars with wormhole topology
We investigate a novel gravitational configuration formed by a massless real phantom field and an axion scalar field, minimally coupled to gravity. This system describes an Ellis-type wormhole situated at the center of an axion star. By normalizing the mass of the axion field to unity, the physical properties of the model are determined by three independent parameters: the potential's decay constant, the frequency of the axion field, and the wormhole's throat parameter. We assess the traversabi…

A new solution of Einstein-Maxwell field equations in isotropic coordinates
B S Ratanpal, Bhavesh Suthar
https://arxiv.org/abs/2508.16404 https://arxiv.org…

A new solution of Einstein-Maxwell field equations in isotropic coordinates
In this work, we provide a novel exact solution to the Einstein-Maxwell field equations in isotropic coordinates for charged anisotropic matter distribution, achieved by considering one of the metric potentials as well as a particular form of pressure anisotropy and electric field. We analysed all physical features of a realistic star to ensure the model's viability, and we observed that it met all the physical plausibility conditions. The gravitational potentials and matter variables are well-…

Heat Capacity and the Violation of Scaling Laws in Gravitational System
Shi-Bei Kong
https://arxiv.org/abs/2507.20992 https://arxiv.org/pdf/2507.20992

Heat Capacity and the Violation of Scaling Laws in Gravitational System
In this paper, we examine the scaling laws in gravitational system from the perspective of free energy landscape. It has been found that for some special black holes, their critical exponents are beyond mean field theory, and more surprisingly violate the scaling laws. We find that the main reason for the violation of the scaling laws is that the heat capacity at constant volume for these black holes is 0, so the critical exponent $α$ is often treated as 0 and can not be derived from the scali…

Observational constraints on the nonlinear regime of gravity with a parametrized beyond-GR gravitational waveform model
Daiki Watarai, Atsushi Nishizawa, Hiroki Takeda, Hayato Imafuku, Kipp Cannon
https://arxiv.org/abs/2509.17592

Observational constraints on the nonlinear regime of gravity with a parametrized beyond-GR gravitational waveform model
Gravitational waves from compact binary coalescences provide unique opportunities to test general relativity (GR) in the strong-field regime. In particular, the merger phase, during which two compact objects finally coalesce, corresponds to the regime of the strongest gravitational fields accessible by direct observation and thus serves as a probe of the nonlinear nature of gravity. In this work, we test GR in the merger phase by analyzing GW150914 using a modified waveform proposed in [Watarai…

On fine alignment of transmitted beams for TianQin with far-field wavefront error
Dezhi Wang, Xuefeng Zhang, Hui-Zong Duan
https://arxiv.org/abs/2508.20589 https://

On fine alignment of transmitted beams for TianQin with far-field wavefront error
TianQin is a proposed space-based gravitational wave detector mission that employs inter-satellite laser interferometry. Suppressing measurement noise and achieving high sensitivity require accurate alignment of multiple onboard interferometers after laser link acquisition. However, due to huge armlengths and varying point-ahead angles, the fine alignment of the transmitted beams can be particularly challenging, which needs to take into account both received laser power and far-field wavefront …