Tootfinder

The Study on Modified Theories of General Relativity: A Differential Geometric Approach
N. S. Kavya
https://arxiv.org/abs/2507.04031 https://

The Study on Modified Theories of General Relativity: A Differential Geometric Approach
The introduction of General Relativity (GR) in 1915 revolutionized our understanding of gravity, but over time, its limitations in explaining phenomena like dark energy, dark matter, and quantum gravity have motivated alternative theories. Early modifications, such as Weyl's 1919 proposal, focused on adding higher-order terms to the Einstein-Hilbert action. GR's non-renormalizability further strengthened the case for extending it. A central theme of modern gravity research is modifying the geom…

Regulator and gauge dependence of the Abelian gauge coupling in asymptotically safe quantum gravity
Maksym Riabokon, Marc Schiffer, Fabian Wagner
https://arxiv.org/abs/2508.03563

Regulator and gauge dependence of the Abelian gauge coupling in asymptotically safe quantum gravity
Both General Relativity and the Standard Model of particle physics are not UV complete. General Relativity is perturbatively non-renormalizable, while the Standard Model features Landau poles, where couplings are predicted to diverge at finite energies, e.g., in the Abelian gauge sector. Asymptotically safe quantum gravity may resolve both of these issues at the same time. In this paper, we assess the systematic uncertainties associated with this scenario, in particular with the gravitationally…

Optimal Detection Bands for Intermediate-Mass Black Hole Binaries: Prospects for LISA and AMIGO in General Relativity and $f(R, T)$ Gravity
Marcelo M. Lapola, Oswaldo D. Miranda
https://arxiv.org/abs/2507.04392

Optimal Detection Bands for Intermediate-Mass Black Hole Binaries: Prospects for LISA and AMIGO in General Relativity and $f(R, T)$ Gravity
We present a semi analytic forecast for the detection of intermediate mass black hole (IMBH) binaries with the space based detectors LISA (millihertz band) and AMIGO (deci hertz band). A redshift dependent population model is built from extrapolated black hole mass functions and realistic pairing and merger time scales. Folding this population through the instrument sensitivities yields event rates of about 1e4 mergers for LISA in four observing years and between 1e2 and 1e3 mergers for AMIGO i…

$\nu p$-process in Core-Collapse Supernovae: Imprints of General Relativistic Effects
Alexander Friedland, Derek J. Li, Giuseppe Lucente, Ian Padilla-Gay, Amol V. Patwardhan
https://arxiv.org/abs/2508.02055

$νp$-process in Core-Collapse Supernovae: Imprints of General Relativistic Effects
The origin of certain proton-rich isotopes in the solar system, particularly $^{92,94}{\rm Mo}$ and $^{96,98}{\rm Ru}$, has been a long-standing puzzle. A promising explanation is the $νp$-process, which is posited to operate in the neutrino-driven outflows that form inside core-collapse supernovae after shock revival. Recent studies have identified several relevant physical effects that influence the yields of this process. The impact of General Relativity (GR) on the $νp$-process yields, ho…

Icarus's Orbit as the Ultimate Test for the Vulcan Hypothesis and General Relativity
Souren Petik Pogossian
https://arxiv.org/abs/2507.01569 https://…

Icarus's Orbit as the Ultimate Test for the Vulcan Hypothesis and General Relativity
General Relativity (GR) quantitatively accounts for the anomalous perihelion precession observed in several planets' orbits, with Mercury exhibiting the most significant deviation from Newtonian predictions. In the present work, I carry out an in-depth study comparing methods for calculating perihelion advance of inner planets using two methods, one based on the rotation of the Laplace-Runge-Lentz vector and the other on the evolution of the perihelion longitude. I show that, although the two m…

The $1/c$ expansion of general relativity in a $3 1$ formulation, revisited
Mahmut Elbistan
https://arxiv.org/abs/2508.03548 https://arxiv.org/pdf/2508.035…

The $1/c$ expansion of general relativity in a $3+1$ formulation, revisited
We study the $1/c$ expansion of general relativity within a formulation that is compatible with both the Arnowitt-Deser-Misner and the Kol-Smolkin decompositions. The Einstein-Hilbert action takes a common form for those decompositions as they are dual to each other. We first develop a method to expand this generic form and then push the expansion up to $c^{-3}$ order within this novel approach. Next, we apply our technique to the Arnowitt-Deser-Misner decomposition and expand it up to $c^{-3}$…

A novel test of gravity: Does spacetime geometry track matter density?
Camille Bonvin, Nastassia Grimm, Isaac Tutusaus
https://arxiv.org/abs/2506.04387 htt…

A novel test of gravity: Does spacetime geometry track matter density?
We propose a novel test of gravity that combines galaxy clustering with gravitational lensing. In general relativity, the evolution of matter density fluctuations and of the Weyl potential -- the sum of spatial and temporal distortions of the geometry -- are governed by the same growth function. In contrast, alternative theories of gravity that modify the relation between geometry and matter content can lead to differences in these two growths. Exploiting a recent method to directly measure the…

Viscosity in Isotropic Cosmological Backgrounds in General Relativity and Starobinsky Gravity
Eliseo Pavone, Luigi Tedesco
https://arxiv.org/abs/2506.05180

Viscosity in Isotropic Cosmological Backgrounds in General Relativity and Starobinsky Gravity
We present a general analysis of the role of shear viscosity in cosmological backgrounds, focusing on isotropic space-time in both Einstein and $f(R)$ gravity. By computing the divergence of the stress-energy tensor in a general class of isotropic (but not necessarily homogeneous) geometries, we show that shear viscosity does not contribute to the background dynamics when the fluid is comoving. This result holds in both the Jordan and Einstein frames, and implies that shear viscosity cannot aff…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Sourced metric perturbations of Kerr spacetime in Lorenz gauge
Barry Wardell, Chris Kavanagh, Sam R. Dolan
…

Test of conformal gravity as an alternative to dark matter from the observations of elliptical galaxies
Li-Xue Yue, Da-Ming Chen
https://arxiv.org/abs/2506.03955

Test of conformal gravity as an alternative to dark matter from the observations of elliptical galaxies
As an alternative gravitational theory to General Relativity (GR), the Conformal Gravity (CG) has recently been successfully verified by observations of Type Ia supernovae (SN Ia) and the rotation curves of spiral galaxies. The observations of galaxies only pertain to the non-relativistic form of gravity. In this context, within the framework of the Newtonian theory of gravity (the non-relativistic form of GR), dark matter is postulated to account for the observations. On the other hand, the no…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Simulating Hawking radiation in quantum many-body systems: deviations from the thermal spectrum
Gokhan Alkac, Ege \"Ozg\"un

This https://arxiv.org/abs/2406.19533 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qu…

Testing quantum theory on curved space-time with quantum networks
Quantum technologies present new opportunities for fundamental tests of nature. One potential application is to probe the interplay between quantum physics and general relativity - a field of physics with no empirical evidence yet. Here we show that quantum networks open a new window to test this interface. We demonstrate how photon mediated entanglement between atomic or atom-like systems can be used to probe time-dilation induced entanglement and interference modulation. Key are non-local mea…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[2/2]:
- Generalised Aichelburg-Sexl and Self-Force for photons
Abedennour Dib, Aymeric Garnier, Alessandro Spallicci

This https://arxiv.org/abs/2311.07459 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

On homogeneous plane waves
Plane waves are a special class of Lorentzian spaces with a parallel null vector field. They are of great importance in Geometry (e.g. Lorentzian holonomy) and in Physics (General Relativity as well as alternative gravity theories). Our contribution in the present paper aims at a rigorous mathematical treatment focusing on completeness of Killing fields, and globality of coordinates. Equivalence of different approaches to plane waves is by no means easy to handle. We use here cohomogeneity one …

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/2]:
- Particle Production Scenario in an Algebraically Coupled Quintessence Field with a Dark Matter Fluid
Saddam Hussain

Physical implications of four dimensional braided noncommutative gravity
Milorad Be\v{z}ani\'c, Marija Dimitrijevi\'c \'Ciri\'c, Biljana Nikoli\'c, Voja Radovanovi\'c
https://arxiv.org/abs/2508.02205

Physical implications of four dimensional braided noncommutative gravity
The formulation of gravity theories on noncommutative (NC) spacetimes has been an active area of research for some time. Various models and methods have been proposed in the literature. Even within the star-product formalism, there are several distinct approaches to constructing NC deformations of General Relativity (GR) and Einstein-Cartan-Palatini (ECP) gravity. Some models are based on the NC local Lorentz symmetry, while others rely on NC deformations of the diffeomorphism symmetry of GR. I…

[2025-08-07 Thu (UTC), 19 new articles found for gr-qc General Relativity and Quantum Cosmology]
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Do Pulsar Timing Datasets Favor Massive Gravity?
Chris Choi, Tina Kahniashvili
https://arxiv.org/abs/2507.02059 https://arxiv.org/pdf…

Do Pulsar Timing Datasets Favor Massive Gravity?
Several observational phenomena suggest that the standard model of cosmology and particle physics requires revision. To address this, we consider the extension of general relativity known as massive gravity (MG). In this Letter, we explore the imprints of MG on the propagation of gravitational waves (GWs): their modified dispersion relation and their additional (two vector and one scalar) polarization modes on the stochastic GW background (SGWB) detected by pulsar timing arrays (PTAs). We analy…

Radiation GRMHD Models of Accretion onto Stellar-Mass Black Holes: I. Survey of Eddington Ratios
Lizhong Zhang, James M. Stone, Patrick D. Mullen, Shane W. Davis, Yan-Fei Jiang, Christopher J. White
https://arxiv.org/abs/2506.02289

Radiation GRMHD Models of Accretion onto Stellar-Mass Black Holes: I. Survey of Eddington Ratios
We summarize results from a survey of radiation-dominated black hole accretion flows across a wide range of mass accretion rates, as well as two values of black hole spin and initial magnetic field geometry. These models apply an algorithm targeting direct solutions to the radiation transport equation in full general relativity and have been enabled by access to modern exascale computing systems. Super-Eddington accretion flows form geometrically thick radiation pressure supported disks that dr…

[2025-08-08 Fri (UTC), 14 new articles found for gr-qc General Relativity and Quantum Cosmology]
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[2025-07-07 Mon (UTC), no new articles found for gr-qc General Relativity and Quantum Cosmology]
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Replaced article(s) found for math.DG. https://arxiv.org/list/math.DG/new
[1/1]:
- New perspectives on the d'Alembertian from general relativity. An invitation
Mathias Braun

Vacuum energy in effective field theory of general relativity
E. Epelbaum, J. Gegelia, Ulf-G. Mei{\ss}ner
https://arxiv.org/abs/2506.19182 https://

Vacuum energy in effective field theory of general relativity
It is shown to all orders of perturbation theory that in the effective field theory of general relativity the condition of vanishing of the vacuum energy leads to the same value of the cosmological constant, viewed as a parameter of the effective Lagrangian, as obtained by demanding the consistency of the effective field theory in Minkowski background. The resulting effective action is characterized by the cosmological constant term that vanishes exactly.

Post-Newtonian expansion of scale-dependent gravity
Nicolas R. Bertini, Marcos H. Novaes
https://arxiv.org/abs/2508.04810 https://arxiv.org/pdf/2508.04810

Post-Newtonian expansion of scale-dependent gravity
Scale-dependent gravity is an extension of general relativity in which the Newton and cosmological constants may vary slightly with the energy scale due to remnant low-energy quantum effects. A fundamental feature of this approach is the scale-setting procedure. In a previous work by one of the authors, a covariant expression for the scale, consistent with conservation laws, was established. Here, we apply the full Will-Nordtvedt version of the parameterized post-Newtonian (PPN) formalism to th…

Impact of a granular mass distribution on the orbit of S2 in the Galactic center
Matteo Sadun Bordoni, Roberto Capuzzo Dolcetta, Aleksey Generozov, Guillaume Bourdarot, Antonia Drescher, Frank Eisenhauer, Reinhard Genzel, Stefan Gillessen, Simran Joharle, Felix Mang, Thomas Ott, Diogo C. Ribeiro, Sebastiano D. von Fellenberg
https://

Impact of a granular mass distribution on the orbit of S2 in the Galactic center
The orbit of the S2 star around Sagittarius A* provides a unique opportunity to test general relativity and study dynamical processes near a supermassive black hole. Observations have shown that the orbit of S2 is consistent with a Schwarzschild orbit at a 10$σ$ confidence level, constraining the amount of extended mass within its orbit to less than 1200 M$_\odot$, under the assumption of a smooth, spherically symmetric mass distribution. In this work we investigate the effects on the S2 orbit…

Suppressed Intrinsic Curvature Gravity
Ido Ben-Dayan, Elena Emtsova
https://arxiv.org/abs/2507.04502 https://arxiv.org/pdf/2507.04502…

Suppressed Intrinsic Curvature Gravity
We consider various mechanisms of modifying the effect of intrinsic curvature in gravity with respect to general relativity. Two primary approaches are studied. First, by considering a Lagrange multiplier or an auxiliary field. Second, by non-minimal coupling between a scalar field and the intrinsic curvature scalar. We reproduce the basic solutions of FLRW cosmology, black hole solutions, Lense-Thirring effect, and gravitational waves. The speed of gravitational waves is modified in comparison…

Kullback-Leibler Divergence as a Measure of Irreversible Information Loss Near Black Hole Horizons
Tatsuaki Tsuruyama
https://arxiv.org/abs/2508.04348 https://

Kullback-Leibler Divergence as a Measure of Irreversible Information Loss Near Black Hole Horizons
We present a unified theoretical framework that integrates information theory, thermodynamics, and general relativity to analyze the fundamental limit of decoding time-encoded signals in curved spacetime. In particular, we introduce the Kullback-Leibler divergence (KLD) as a quantitative measure of the mismatch between the transmitted and received symbol distributions induced by gravitational time dilation. Using a minimal communication model, we derive the critical radius at which information …

A Gaussian process framework for testing general relativity with gravitational waves
Lachlan Passenger, Shun Yin Cheung, Nir Guttman, Nikhil Kannachel, Paul D. Lasky, Eric Thrane
https://arxiv.org/abs/2507.01294

A Gaussian process framework for testing general relativity with gravitational waves
Gravitational-wave astronomy provides a promising avenue for the discovery of new physics beyond general relativity as it probes extreme curvature and ultra-relativistic dynamics. However, in the absence of a compelling alternative to general relativity, it is difficult to carry out an analysis that allows for a wide range of deviations. To that end, we introduce a Gaussian process framework to search for deviations from general relativity in gravitational-wave signals from binary black hole me…

Regular Magnetically Charged Black Holes from Nonlinear Electrodynamics: Thermodynamics, Light Deflection, and Orbital Dynamics
Ekrem Aydiner, Erdem Sucu, \.Izzet Sakall{\i}
https://arxiv.org/abs/2507.05145

Regular Magnetically Charged Black Holes from Nonlinear Electrodynamics: Thermodynamics, Light Deflection, and Orbital Dynamics
We investigate the thermodynamic properties, light deflection, and orbital dynamics of regular magnetically charged black holes (NRCBHs) arising from nonlinear electrodynamics (NED) coupled to general relativity. The metric function $f(r)$ ensures complete regularity at the origin while maintaining asymptotic flatness, with the extremal magnetic charge limit reaching $q_{\text{ext}} \approx 2.54M$, significantly exceeding the Reissner-Nordström value. Using the quantum tunneling framework, we …

This https://arxiv.org/abs/2206.00780 has been replaced.
link: https://scholar.google.com/scholar?q=a

The BRST Double Complex for the Coupling of Gravity to Gauge Theories
We consider (effective) Quantum General Relativity coupled to the Standard Model (QGR-SM) and clarify whether graviton-ghosts couple to matter particles. To this end, we examine the corresponding BRST and anti-BRST symmetries, which are generated by infinitesimal diffeomorphisms and infinitesimal gauge transformations. In particular, we study their properties and relations: We find that all differentials mutually anticommute, which implies that they form a double complex. In particular, we intr…

This https://arxiv.org/abs/2503.05651 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Inverting no-hair theorems: How requiring General Relativity solutions restricts scalar-tensor theories
Black hole solutions in general scalar-tensor theories are known to permit hair, i.e. non-trivial scalar profiles and/or metric solutions different from the ones of General Relativity (GR). Imposing that some such solutions$\unicode{x2013}$e.g. Schwarzschild or de Sitter solutions motivated in the context of black hole physics or cosmology$\unicode{x2013}$should exist, the space of scalar-tensor theories is strongly restricted. Here we investigate precisely what these restrictions are within ge…

New Agegraphic Dark Energy Driven Reconstruction of \boldmath{$f(Q)$} Gravity and its Cosmological Implications
Rajdeep Mazumdar, Kalyan Malakar, Mrinnoy M. Gohain, Kalyan Bhuyan
https://arxiv.org/abs/2507.00878

New Agegraphic Dark Energy Driven Reconstruction of \boldmath{$f(Q)$} Gravity and its Cosmological Implications
In this work, we perform reconstruction of \( f(Q) \) gravity inspired by the New Agegraphic Dark Energy (NADE) model, aiming to account for the Universe's late time acceleration without invoking a cosmological constant. Utilizing a power law scale factor \( a(t) = a_0 t^h \), we derive an analytic form for \( f(Q) \) based on a correspondence with NADE, where the conformal time serves as the infrared cutoff. The resulting model naturally recovers General Relativity in the limit and exhibits a …

$\mathrm{SL}(2,\mathbb{R})$ families of Kerr black holes
Robert Penna
https://arxiv.org/abs/2506.00184 https://arxiv.org/pdf/2506.001…

$\mathrm{SL}(2,\mathbb{R})$ families of Kerr black holes
The stationary, axisymmetric sector of vacuum general relativity (with zero cosmological constant) enjoys an $\mathrm{SL}(2,\mathbb{R})$ symmetry called the Matzner-Misner group. We study the action of the Matzner-Misner group on the Kerr black hole. We show that the group acts naturally on a three parameter generalization of the usual two parameter Kerr solution. The new parameter represents a large diffeomorphism which gives the spacetime an asymptotic angular velocity. We explain how the $\m…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Eikonal gravitational-wave lensing in Einstein-aether theory
Julius Streibert, Hector O. Silva, Miguel Zumalac\'arregui

[2025-08-06 Wed (UTC), 19 new articles found for gr-qc General Relativity and Quantum Cosmology]
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On the viability of minimal Ho\v{r}ava gravity
Ted Jacobson, Pranav Pulakkat
https://arxiv.org/abs/2508.03106 https://arxiv.org/pdf/2508.03106

On the viability of minimal Hořava gravity
Hořava gravity is a Lorentz-violating modification of general relativity (GR) with a preferred spacelike foliation. Observational evidence has put strong constraints on the parameter values in this model, so that the remaining viable sector is well-characterized by the Newton constant and a single additional parameter. We analyze this restricted theory, which is called minimal Hořava gravity ($\mathrm{mHg}$), from the Hamiltonian point of view. We find that in order to eliminate a pathologica…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[2/2]:
- The threshold for PBH formation in the type-II region and its analytical estimation
Albert Escriv\`a

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/2]:
- Anti-Gravity from Vacancies in Fractal Space-Time: The Case of a Menger Sponge
Karl Svozil

Constraining Cubic Curvature Corrections to General Relativity with Quasi-Periodic Oscillations
Alireza Allahyari, Liang Ma, Shinji Mukohyama, Yi Pang
https://arxiv.org/abs/2506.22548

Constraining Cubic Curvature Corrections to General Relativity with Quasi-Periodic Oscillations
We investigate observational constraints on cubic curvature corrections to general relativity by analyzing quasi-periodic oscillations (QPOs) in accreting black hole systems. In particular, we study Kerr black hole solution corrected by cubic curvature terms parameterized by $β_5$ and $β_6$. While $β_6$ corresponds to a field-redefinition invariant structure, the $β_5$ term can in principle be removed via a field redefinition. Nonetheless, since we work in the frame where the accreting matt…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Improved inspiral-merger-ringdown model for BBHs on elliptical orbits
Pratul Manna, Tamal RoyChowdhury, Chandra Kant Mishra

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Impacts of wormholes on false vacuum bubble tunneling
Hong Wang, Yuxuan Wu, Ran Li, Jin Wang

[2025-06-05 Thu (UTC), 17 new articles found for gr-qc General Relativity and Quantum Cosmology]
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Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/2]:
- Modified General Relativity and dark matter
Gary Nash
https:/…

This https://arxiv.org/abs/2505.14446 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Light deflection in unified gravity and measurable deviation from general relativity
Light, though massless, does not travel in a perfectly straight line when it passes near a massive object. Instead, it follows the curvature of spacetime - a phenomenon predicted by Einstein's general theory of relativity. This effect, known as gravitational lensing, occurs because massive bodies like stars, galaxies, or black holes distort the fabric of spacetime around them, bending the path of light much like a lens bends rays in optics. In this work, we study gravitational lensing using the…

This https://arxiv.org/abs/2412.06043 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Probing Gravity -- Fundamental Aspects of Metric Theories and their Implications for Tests of General Relativity
Guided by the Einstein equivalence principle that identifies the phenomenon of gravitation as a manifestation of the dynamics of spacetime in contrast to a localizable force, we review and explore its consequences on formulating a theory of gravity. The resulting space of metric theories of gravity may address open conceptual and observational puzzles through a wealth of effects beyond general relativity, whose traces can be searched for within today's and tomorrow's gravitational testing groun…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[2/2]:
- Black Holes as Condensation Points of Fuzzy Dark Matter Cores
Curicaveri Palomares-Chavez, Ivan Alvarez-Rios, Francisco S. Guzman

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/2]:
- Inflation Alternative via the Gravitational Field of a Singularity
Michael Zlotnikov
…

[2025-07-04 Fri (UTC), 21 new articles found for gr-qc General Relativity and Quantum Cosmology]
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[2025-08-04 Mon (UTC), 14 new articles found for gr-qc General Relativity and Quantum Cosmology]
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A search for extra polarisations using a Gaussian process in Gravitational-Wave Transient Catalogue 3
Shun Yin Cheung, Lachlan Passenger, Paul D. Lasky, Eric Thrane
https://arxiv.org/abs/2507.02335

A search for extra polarisations using a Gaussian process in Gravitational-Wave Transient Catalogue 3
General relativity predicts that gravitational waves are described by two polarisation states: the plus $+$ state and cross $\times$ state. However, alternate theories of gravity allow up to six polarisations. We employ the gravitational-wave null stream, a linear combination of three or more detectors where the $+$ and $\times$ signals add to zero, leaving behind noise and potentially gravitational waves in non-standard polarisation states. We develop a Gaussian process model to search for ext…

Rigidity aspects of a cosmological singularity theorem
Eric Ling, Carl Rossdeutscher, Walter Simon, Roland Steinbauer
https://arxiv.org/abs/2508.00524 https://

Rigidity aspects of a cosmological singularity theorem
Inspired by the classical singularity theorems in General Relativity, Galloway and Ling have shown the following (cf. Theorem 0): If a globally hyperbolic spacetime satisfying the null energy condition contains a closed, spacelike Cauchy surface $(V,g,K)$ (with metric $g$ and extrinsic curvature ${K}$) which is strictly 2-convex (meaning that the sum of the lowest two eigenvalues of $K$ is positive) then $V$ is either a spherical space or past null geodesically incomplete \cite{Ling, Ling2}. In…

Revisiting Coincident GR in Internal STEGR Formulation
Kyosuke Tomonari, Taishi Katsuragawa, Shin'ichi Nojiri
https://arxiv.org/abs/2506.22158 https://…

Revisiting Coincident GR in Internal STEGR Formulation
We revisit Coincident General Relativity (CGR) in the gauge approach to gravity based on Symmetric Teleparallel Equivalent to General Relativity (STEGR) in the {\it internal-space formulation}, which one of the authors recently proposed in Ref.~[J. Math. Phys. 66 (2025) 5, 052505]. First, we review the standard formulation of STEGR theories in the Palatini approach to gravity, in which formulation we impose the teleparallel and torsion-free conditions by using Lagrange multipliers. Second, we i…

Thermal aspects of the anomalous $\omega \to \infty$ limit of Brans-Dicke gravity
L. Gallerani, A. Giusti, A. Mentrelli, V. Faraoni
https://arxiv.org/abs/2508.00498 https://

Thermal aspects of the anomalous $ω\to \infty$ limit of Brans-Dicke gravity
Brans-Dicke gravity does not always reduce to General Relativity in the limit $ω\to\infty$ for the coupling constant. This anomalous behavior is examined within the formalism of the first-order thermodynamics of scalar-tensor gravity. It is shown that this effect is linked to the non-vanishing nature of the chemical potential, in the Einstein frame formulation of the thermodynamic analogy, in the $ω\to\infty$ limit.

Singularity Avoidance in Gravitational Collapse of an Inhomogeneous Fluid in Rastall Gravity
Akbar Jahan, Halime Miraghaei, Shayesteh Ghaffari, Amir Hadi Ziaie
https://arxiv.org/abs/2507.02026

Singularity Avoidance in Gravitational Collapse of an Inhomogeneous Fluid in Rastall Gravity
Various types of inhomogeneous collapse models in general relativity (GR) lead to the formation of spacetime singularities either visible or hidden by a spacetime horizon. Our aim in the present work is to search for nonsingular models in Rastall gravity that arise as the final outcomes of spherically symmetric gravitational collapse of an inhomogeneous matter cloud. We firstly assume linear equations of state (EoS) for radial and tangential pressure profiles, i.e., $p_r=w_rρ$ and $p_θ=w_θρ…

Exploring black hole shadows in axisymmetric spacetimes with coordinate-independent methods and neural networks
Temurbek Mirzaev, Bobomurat Ahmedov, Cosimo Bambi
https://arxiv.org/abs/2507.02520

Exploring black hole shadows in axisymmetric spacetimes with coordinate-independent methods and neural networks
The study of black hole shadows provides a powerful tool for testing the predictions of general relativity and exploring deviations from the standard Kerr metric in the strong gravitational field regime. Here, we investigate the shadow properties of axisymmetric gravitational compact objects using a coordinate-independent formalism. We analyze black hole shadows in various spacetime geometries, including the Kerr, Taub-NUT, $γ$, and Kaluza-Klein metrics, to identify distinctive features that c…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Dynamical analysis of logarithmic energy-momentum squared gravity
Giovanni Acquaviva, Nihan Katirci

Analogy of space-time as an elastic medium -- Study of the perturbation tensor of the metric $h_{\mu\nu}$ through the prism of the analogy of the theory of elasticity -- Analysis and potential consequences
David Izabel, Yves Remond, Matteo Lucas Ruggiero
https://arxiv.org/abs/2506.21984 …

Analogy of space-time as an elastic medium -- Study of the perturbation tensor of the metric $h_{μν}$ through the prism of the analogy of the theory of elasticity -- Analysis and potential consequences
A state of the art of the different deformations of space-time measured for more than a hundred years in the case of general relativity in the weak field is carried out. The phenomena of general relativity in low fields targeted are gravitational waves, Lense-thirring effects, gravitational lensing, gravitation around the earth or the sun. The overview of these different deformations highlights the different active components of the perturbation tensor of the metric $h_{μν}$. The authors show…

Functional inference on deviations from General Relativity
Costantino Pacilio, Riccardo Buscicchio
https://arxiv.org/abs/2507.13454 https://

Functional inference on deviations from General Relativity
Extensions of general relativity often predict modifications to gravitational waveform morphology that depend functionally on source parameters, such as the masses and spins of coalescing black holes. However, current analyses of strong-field gravity lack robust, data-driven methods to infer such functional dependencies. In this work, we introduce GRANITA, a non-perturbative, theory-agnostic framework to characterize parameter-dependent deviations from general relativity using Gaussian process …

This https://arxiv.org/abs/2406.05820 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Thermodynamic phase description of charged 4D Gauss-Bonnet black holes in quantum regime
Glavan and Lin [Phys. Rev. Lett. 124, 081301 (2020)] ave argued for a 4D theory of Gauss-Bonnet (GB)gravity. This model predicts significant contributions of the GB coupling parameter $α$ to gravitational dynamics, while circumventing the Lovelock theorem and avoiding Ostrogradsky instability. As a powerful competitor to general relativity (GR), the model has been examined on various phenomenological grounds. Here, we employ a technique from information geometry to analyze the thermodynamic ph…

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…

Strong hyperboloidal compactification for the spherical DF-GHG formulation of GR
Christian Peterson, David Hilditch
https://arxiv.org/abs/2506.03078 https:…

Strong hyperboloidal compactification for the spherical DF-GHG formulation of GR
The use of compactified hyperboloidal coordinates for metric formulations of the Einstein field Equations introduces formally singular terms in the equations of motion whose numerical treatment requires care. In this paper we study a particular choice of constraint addition, choice of gauge and reduction fields in order to minimize the number of these terms in a spherically symmetric reduction of the Dual-Foliation Generalized Harmonic Gauge formulation of General Relativity. We proceed to the …

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Structural stability and general relativity
Spiros Cotsakis
h…

[2025-07-03 Thu (UTC), 17 new articles found for gr-qc General Relativity and Quantum Cosmology]
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Generic EFT-motivated beyond General Relativity gravitational wave tests and their curvature dependence: from observation to interpretation
Laura Bernard, Suvendu Giri, Luis Lehner, Riccardo Sturani
https://arxiv.org/abs/2507.17143

Generic EFT-motivated beyond General Relativity gravitational wave tests and their curvature dependence: from observation to interpretation
We present a "dictionary" to expedite the identification of potential deviations in gravitational waveforms from those predicted by General Relativity (GR) during the inspiral phase of black hole binaries. Assuming deviations from GR can be described by a local Effective Field Theory (EFT) formulated in terms of curvature operators (and possibly additional scalar fields), this dictionary characterizes how deviations scale with the masses of the binary components and identifies the leading order…

Superradiant Axionic Black-Hole Clouds as Seeds for Graviton Squeezing
Panagiotis Dorlis, Nick E. Mavromatos, Sarben Sarkar, Sotirios-Neilos Vlachos
https://arxiv.org/abs/2507.01689

Superradiant Axionic Black-Hole Clouds as Seeds for Graviton Squeezing
It is shown that both, standard general relativity (GR) and Chern-Simons (CS) gravity, the latter containing chiral gravitational anomaly terms, seed the production of pairs of entangled gravitons in a multi-mode squeezed state. This involves the interaction of gravitons with the axionic cloud surrounding a superradiant Kerr (rotating) black hole background. The order of magnitude of the squeezing effect, specifically the number of graviton excitations in the squeezed vacuum, is estimated in th…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[2/2]:
- On the Dark-Energy Enigma
Ali H. Chamseddine, J\"urg Fr\"ohlich

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Relativistic Corrections and Structure Formation in Dark Matter Superfluidity
Seturumane Tema

Exact vacuum solution with Hopf structure in general relativity
Junpei Harada
https://arxiv.org/abs/2506.20878 https://arxiv.org/pdf/…

Exact vacuum solution with Hopf structure in general relativity
An exact solution to the vacuum Einstein equations is presented, whose structure is based on the Hopf fibration. The solution employs a geodesic null vector field that defines a twisting congruence and appears in the metric in Kerr-Schild form. This solution is of Petrov type D and involves two parameters. Remarkably, the resulting spacetime is regular, with no curvature singularities. Both the Kretschmann scalar and the Chern-Pontryagin scalar are nonzero and remain finite throughout the space…

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…

Deriving Entangled Relativity
Olivier Minazzoli (ARTEMIS), Maxime Wavasseur (ARTEMIS), Thomas Chehab (ARTEMIS)
https://arxiv.org/abs/2506.15209 https://

Deriving Entangled Relativity
Entangled Relativity is a non-linear reformulation of Einstein's theory that cannot be defined in the absence of matter fields. It recovers General Relativity in the weak matter density limit or whenever $\mathcal{L}_m = T$ on-shell, and it is also more parsimonious in terms of fundamental constants and units. In this paper, we show that Entangled Relativity can be derived from a general $f(R,\mathcal{L}_m)$ theory by imposing a single requirement: the theory must admit all solutions of General…

Well-posed geometric boundary data in General Relativity, III: conformal-volume boundary data
Zhongshan An, Michael T. Anderson
https://arxiv.org/abs/2507.15567

Well-posed geometric boundary data in General Relativity, III: conformal-volume boundary data
In this third work in a series, we prove the local-in-time well-posedness of the IBVP for the vacuum Einstein equations in general relativity with twisted DIrichlet boundary conditions on a finite timelike boundary. The boundary conditions consist of specification of the pointwise conformal class of the boundary metric, together with a scalar density involving a combination of the volume form of the bulk metric restricted to the boundary together with the volume form of the boundary metric itse…

Structure of Kerr black hole spacetimes in Weyl conformal gravity
Miguel Yulo Asuncion, Keith Horne, Reinosuke Kusano, Martin Dominik
https://arxiv.org/abs/2507.01379

Structure of Kerr black hole spacetimes in Weyl conformal gravity
We analyze the stationary, uncharged, rotating, vacuum solution to Weyl conformal gravity. We elucidate the causal and ergoregion structure of the spacetimes found in the parameter space of the metric for positive mass. These are then compared to the corollary Kerr, Kerr-de Sitter, and Kerr-Anti-de Sitter solutions to general relativity. Additionally, we investigate and derive the extremal limits for both the horizons and ergosurfaces of the spacetimes.

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Exploring modified Kaniadakis entropy: MOND-related theory, the Bekenstein bound conjecture, and ...
Ambr\'osio, Andrade, Alves, Costa, Neto, Thibes

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Gravitational waves from quasielliptic compact binaries in scalar-tensor theory to one-and-a-half...
David Trestini

Searching for intermediate mass ratio binary black hole mergers in the third observing run of LIGO-Virgo-KAGRA
Mark Ho-Yeuk Cheung, Digvijay Wadekar, Ajit Kumar Mehta, Tousif Islam, Javier Roulet, Emanuele Berti, Tejaswi Venumadhav, Barak Zackay, Matias Zaldarriaga
https://arxiv.org/abs/2507.01083

Searching for intermediate mass ratio binary black hole mergers in the third observing run of LIGO-Virgo-KAGRA
Intermediate mass ratio inspirals (IMRIs) of binary black holes with mass ratios $10^{-4}\lesssim q \lesssim 0.1$ are astrophysically interesting sources of gravitational waves. Mergers of intermediate-mass black holes (IMBHs) with stellar-mass black holes would be IMRIs, so their detection can help us probe the formation mechanisms of IMBHs. They can also help us perform precise tests of general relativity due to the presence of strong higher-order mode emission. We perform a search for aligne…

Dynamical theory for spherical black holes in modified gravity
Asier Alonso-Bardaji, David Brizuela
https://arxiv.org/abs/2507.19380 https://arxiv.org/pdf/…

Dynamical theory for spherical black holes in modified gravity
We provide a general algorithm to construct a Hamiltonian, such that its dynamical flow covariantly defines any given spherically symmetric and static metric. This Hamiltonian is defined as a linear combination of the standard (general relativistic) radial diffeomorphism constraint plus a Hamiltonian constraint that is appropriately deformed as compared to its corresponding form in general relativity though it does not include higher-derivative terms. Therefore, given a static model of spherica…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- OGRePy: An Object-Oriented General Relativity Package for Python
Barak Shoshany
htt…

Gravitational Wave Signatures of Periodic Motion near Higher-Derivative Einstein-\AE ther Black Holes
Sayantan Choudhury, Md Khalid Hossain, Gulnur Bauyrzhan, Koblandy Yerzhanov
https://arxiv.org/abs/2507.00904

Gravitational Wave Signatures of Periodic Motion near Higher-Derivative Einstein-Æther Black Holes
Higher-derivative modifications of general relativity are generically expected from effective field theory approaches to quantum gravity, and they arise naturally in Lorentz-violating theories such as Einstein-Ether gravity. In this work, we investigate black hole spacetimes within Einstein-Ether theory supplemented by quadratic curvature corrections, including terms proportional to $R^2$, $R_{μν} R^{μν}$, and $R_{μνλρ} R^{μνλρ}$. We derive the corrected static, spherically symmetri…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[2/2]:
- Exploring the evolution of gravitational-wave emitters with efficient emulation: Constraining the...
Storm Colloms, Christopher P L Berry, John Veitch, Michael Zevin

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/2]:
- Inflation in f(R,T) gravity with Double-Well potential
Biswajit Deb, Atri Deshamukhya

[2025-07-01 Tue (UTC), 13 new articles found for gr-qc General Relativity and Quantum Cosmology]
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[2025-08-01 Fri (UTC), 19 new articles found for gr-qc General Relativity and Quantum Cosmology]
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Lunar and Terrestrial Time Transformation Based on the Principle of General Relativity
Min Liu, Jing-Song Ping, Wen-Xiao Li, Zhou-Jian Cao, Jie Yang, Yong-Jun Wang, Hong-Bo Jin, Wen-Zhao Zhang, Ming-Xue Shao, Jian-Guo Yan, He-Zhen Yu
https://arxiv.org/abs/2507.15456

Lunar and Terrestrial Time Transformation Based on the Principle of General Relativity
Lunar time metrology necessitates a unified temporal framework beyond Earth, requiring an independent lunar system for timekeeping, dissemination, and calendrics. Recent American publications define Lunar Coordinate Time (LTC) within relativity and propose a Terrestrial Time (TT) to LTC conversion formula. However, this formula's derivation and assumptions are contested. The complex dynamics within the solar system can be simplified by decomposing relationships into hierarchical wide-area (exte…

Consequences of Undecidability in Physics on the Theory of Everything
Mir Faizal, Lawrence M. Krauss, Arshid Shabir, Francesco Marino
https://arxiv.org/abs/2507.22950 https://…

Consequences of Undecidability in Physics on the Theory of Everything
General relativity treats spacetime as dynamical and exhibits its breakdown at singularities. This failure is interpreted as evidence that quantum gravity is not a theory formulated within spacetime; instead, it must explain the very emergence of spacetime from deeper quantum degrees of freedom, thereby resolving singularities. Quantum gravity is therefore envisaged as an axiomatic structure, and algorithmic calculations acting on these axioms are expected to generate spacetime. However, Gödel…

Dynamical Love numbers of black holes: theory and gravitational waveforms
Sumanta Chakraborty, Valerio De Luca, Leonardo Gualtieri, Paolo Pani
https://arxiv.org/abs/2507.22994 h…

Dynamical Love numbers of black holes: theory and gravitational waveforms
In General Relativity, the static tidal Love numbers of black holes vanish identically. Whether this remains true for time-dependent tidal fields -- i.e., in the case of dynamical tidal Love numbers -- is an open question, complicated by subtle issues in the definition and computation of the tidal response at finite frequency. In this work, we compute the dynamical tidal perturbations of a Schwarzschild black hole to quadratic order in the tidal frequency. By employing the Teukolsky formalism i…

Doubly regular black holes
Arthur G. Suvorov, Pedro Bargue\~no
https://arxiv.org/abs/2507.23250 https://arxiv.org/pdf/2507.23250

Doubly regular black holes
In addition to curvature singularities, electrovacuum black holes in general relativity exhibit thermodynamic singularities. These so-called Davies' points occur at non-extremal values of charge and spin where the heat capacity diverges and may indicate a type of theoretical incompleteness. The thermodynamic regularity of several families of static, asymptotically-flat spacetimes with bounded curvature invariants is examined using a theory-agnostic framework, showing that while they may be regu…

Teleparallel gravity from the principal bundle viewpoint
Sebastian Brezina, Eugenia Boffo, Martin Kr\v{s}\v{s}\'ak
https://arxiv.org/abs/2507.23672 https://

Teleparallel gravity from the principal bundle viewpoint
We examine whether the Teleparallel Equivalent of General Relativity (TEGR) can be formulated as a gauge theory in the language of connections on principal bundles. We argue in favor of using either the affine bundle with the Poincaré group or, equivalently, the orthonormal frame bundle with the Lorentz group as the structure group. Following the framework of Trautman--where gauge symmetries are determined using the absolute elements--we set to identify the absolute elements and gauge symmetri…

LQG inspired spacetimes as solutions of the Einstein equations
Marcos V. de S. Silva, Carlos F. S. Pereira, G. Alencar, Celio R. Muniz
https://arxiv.org/abs/2506.19818

LQG inspired spacetimes as solutions of the Einstein equations
Black bounces are compact objects with a wormhole structure hidden behind an event horizon. This type of metric can be obtained through general relativity by considering the presence of exotic matter. Such spacetimes can also arise within the framework of effective theories inspired by loop quantum gravity. In this work, we verify the possibility of obtaining black bounce models inspired by loop quantum gravity as solutions of general relativity. For this, we examine which sources can generate …

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[2/2]:
- Assessing cosmological evidence for non-minimal coupling
William J. Wolf, Carlos Garc\'ia-Garc\'ia, Theodore Anton, Pedro G. Ferreira

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/2]:
- When gravitational decoupling and quantum gravity (re)unite
R. Casadio, I. Kuntz, R. da Rocha

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/2]:
- Modified General Relativity and dark matter
Gary Nash
https:/…

Gravitational lensing observables in stationary and axisymmetric solutions in general relativity
Matteo Luca Ruggiero, Davide Astesiano
https://arxiv.org/abs/2506.17192

Gravitational lensing observables in stationary and axisymmetric solutions in general relativity
We investigate light propagation in self-gravitating systems composed of an axially symmetric, stationary, rotating dust fluid. These configurations are intrinsically relativistic, sustained entirely by their rotation, since no compact or finite dust distribution can exist under the same symmetry conditions in Newtonian gravity. In such systems, rotational effects arise from off-diagonal components of the spacetime metric, which are not negligible compared to their Newtonian counterparts. We an…

Spontaneous genesis of naked singularities through quantum-gravitational processes: conclusive evidence for violation of cosmic censorship
Yang Huang, Hongsheng Zhang
https://arxiv.org/abs/2506.22761

Spontaneous genesis of naked singularities through quantum-gravitational processes: conclusive evidence for violation of cosmic censorship
Cosmic censorship conjecture takes a pivotal status in general relativity. We demonstrate that quantum effects, Hawking effect together with Shwinger effect inevitably lead to violation of cosmic censorship. We find that naked singularity spontaneously appears in late time evolution of an isolated large dilatonic black hole. The critical discovery is that the power of Hawking radiation converges to a finite value for an extreme dilatonic black hole, which directly exposes the singularity in fin…

Effective Dynamics of Spherically Symmetric Static Spacetime
Etera R. Livine, Yuki Yokokura
https://arxiv.org/abs/2507.18345 https://arxiv.org/pdf/2507.183…

Effective Dynamics of Spherically Symmetric Static Spacetime
In general relativity, the Einstein equations provide spherically symmetric static spacetimes with dynamics defined as an evolution along the radial coordinate $r$. The geometrical sector becomes a one-dimensional mechanical system, with the Misner-Sharp mass and lapse as canonically conjugate variables, and a vanishing Hamiltonian for pure gravity. Coupling classical or quantum matter fields, or introducing (quantum) corrections to general relativity, then generate a non-vanishing effective Ha…

Relativistic second gradient theory of continuous media
Mina Chapon (LMPS), Lionel Darondeau (IMJ-PRG), Rodrigue Desmorat (LMT, LMPS), Cl\'ement Ecker (LMPS), Boris Kolev (LMPS)
https://arxiv.org/abs/2507.13030

Relativistic second gradient theory of continuous media
Variational Relativity is a framework developed by Souriau in the sixties to better formulate General Relativity and its classical limit\,: Classical Continuum Mechanics. It has been used, for instance, to formulate Hyperelasticity in General Relativity. In that case, two primary variables are involved, the universe (Lorentzian) metric $g$ and the matter field $Ψ$. A Lagrangian density depending on the 1-jet of these variables is then introduced which must satisfy the principle of General Cova…

Multiple-scale analysis of modified gravitational-wave propagation
Marco de Cesare, Mairi Sakellariadou, Benjamin Sutton
https://arxiv.org/abs/2507.23184 https://

Multiple-scale analysis of modified gravitational-wave propagation
We employ multiple-scale analysis to systematically derive analytical approximations describing the cosmological propagation of gravitational waves beyond general relativity, in a framework with two interacting spin-2 fields with time-dependent couplings. Such techniques allow us to accurately track the evolution of a system with slowly evolving time-dependent couplings over a large number of oscillation periods. We focus on tensor modes propagating on sub-horizon scales in a universe dominated…

Canonical Form of Born-Infeld Inspired Gravity Coupled to Scalar Fields
J. Kluson
https://arxiv.org/abs/2507.23424 https://arxiv.org/pdf/2507.23424

Canonical Form of Born-Infeld Inspired Gravity Coupled to Scalar Fields
In this short note we find canonical form of Born-Infeld inspired gravity coupled to scalar fields using Faddeev-Jackiw approach. We show that canonical form of the action splits into two parts: First part has the same form as General Relativity canonical action while the matter part has complicated form as a consequence of the structure of Born-Infeld gravity action.

[2025-06-30 Mon (UTC), 14 new articles found for gr-qc General Relativity and Quantum Cosmology]
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[2025-07-31 Thu (UTC), 16 new articles found for gr-qc General Relativity and Quantum Cosmology]
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Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- The Universe according to DESI results
Davide Batic, Sergio Bravo Medina, Marek Nowakowski