Tootfinder

Generating and Weaving Topological Event Wavepackets in Photonic Spacetime Crystals with Fully Energy-Momentum Gapped
Liang Zhang, Zirui Zhao, Qiaofei Pan, Chenhao Pan, Qingqing Cheng, Yiming Pan
https://arxiv.org/abs/2507.15309

Generating and Weaving Topological Event Wavepackets in Photonic Spacetime Crystals with Fully Energy-Momentum Gapped
We propose a novel type of topological excitation topological event wavepackets (TEWs) emerging in photonic spacetime crystals (STCs) with spacetime modulated dielectric constants. These TEWs exhibit strong spatiotemporal localization and are topologically protected by a fully opened energy momentum (ωk) gap, within which conventional steady states are absent. We further demonstrate that TEWs are spectrally confined within the ωk-gap, providing a combined measurement for probing the emergence…

Optics in spiral dislocation spacetime: Torsion as a geometric waveguide and frequency-filtering mechanism
Semra Gurtas Dogan, Omar Mustafa, Abdullah Guvendi, Hassan Hassanabadi
https://arxiv.org/abs/2507.14865

Optics in spiral dislocation spacetime: Torsion as a geometric waveguide and frequency-filtering mechanism
We present an exact analytical investigation of null trajectories and scalar wave propagation in a $(2+1)$-dimensional spacetime containing a spiral dislocation-a topological defect characterized by torsion in the absence of curvature. For null rays, the torsion parameter $β$ modifies the affine structure, enforcing a finite turning radius $r_{\min} = \sqrt{b^2 - β^2}$ and inducing a torsion-mediated angular deflection that decreases monotonically with increasing $β$. The photon trajectory d…

Quantum thermodynamics in a rotating BTZ black hole spacetime
Wenjing Chen, Yixuan Ma, Si-Wei Han, Zihao Wang, Jun Feng
https://arxiv.org/abs/2507.16787 ht…

Quantum thermodynamics in a rotating BTZ black hole spacetime
We address the problem of the thermalization process for an Unruh-DeWitt (UDW) detector outside a BTZ black hole, from a perspective of quantum thermodynamics. In the context of an open quantum system, we derive the complete dynamics of the detector, which encodes a complicated response to scalar background fields. Using various information theory tools, such as quantum relative entropy, quantum heat, coherence, quantum Fisher information, and quantum speed of evolution, we examined three quant…

Shock formation in 1D conservation laws I: Inviscid structure
John Anderson, Sanchit Chaturvedi, Cole Graham
https://arxiv.org/abs/2506.17148 https://

Shock formation in 1D conservation laws I: Inviscid structure
We study the stability and structure of shock formation in 1D hyperbolic conservation laws. We show that shock formation is stable near shocking simple waves: perturbations form a shock nearby in spacetime. We also characterize the boundary of the classical development in a spacetime neighborhood of the first time singularity. Finally, we describe the precise nature of nondegenerate shock formation through an expansion in homogeneous functions of fractional degree. We use these results in a com…

Observational Constraints on Scalar Field--Matter Interaction in Weyl Integrable Spacetime
Andronikos Paliathanasis
https://arxiv.org/abs/2506.16223 https:…

Observational Constraints on Scalar Field--Matter Interaction in Weyl Integrable Spacetime
We test an analytic cosmological solution within the framework of Weyl Integrable Spacetime using current observational data. In this model, dark energy is described by a pressureless fluid, while a scalar field arises naturally through the definition of the connection. This gravitational theory reveals a Chameleon Mechanism leading to a nonzero interaction between the scalar field and the matter sector. This model extends the standard $Λ$CDM cosmology by introducing one additional degree of f…

Spacetime duality between sequential and measurement-feedback circuits
Tsung-Cheng Lu, Sarang Gopalakrishnan, Yizhi You
https://arxiv.org/abs/2507.12523 ht…

Spacetime duality between sequential and measurement-feedback circuits
Two prevalent approaches for preparing long-range entangled quantum states are (i) linear-depth sequential unitary (SU) circuits, which apply local unitary gates sequentially, and (ii) constant-depth measurement-feedback (MF) circuits, which employ mid-circuit measurements and conditional feedback based on measurement outcomes. Here, we establish that a broad class of SU and MF circuits are dual to each other under a spacetime rotation. We investigate this spacetime duality in the preparation o…

Influence of the external electromagnetic field on the properties of the Novikov-Thorne accretion disk in Kerr spacetime
Shiyang Hu, Yuxiang Zuo, Dan Li, Chen Deng
https://arxiv.org/abs/2507.14599

Influence of the external electromagnetic field on the properties of the Novikov-Thorne accretion disk in Kerr spacetime
The Novikov-Thorne accretion disk model is widely employed in astrophysics, yet computing its blackbody spectrum theoretically requires analytical expressions for the orbital parameters -- specific energy, angular momentum, and angular velocity -- of the constituent timelike particles, a task extremely challenging in non-integrable curved spacetimes. In this work, we numerically obtain these orbital parameters for quasi-Keplerian motion in Kerr spacetime with an asymptotically uniform magnetic …

Physical parameter regression from black hole images via a multiscale adaptive neural network
Jialei Wei, Ao Liu, Dejiang Li, Cuihong Wen
https://arxiv.org/abs/2507.15910

Physical parameter regression from black hole images via a multiscale adaptive neural network
High-precision regression of physical parameters from black hole images generated by General Relativistic Ray Tracing (GRRT) is essential for investigating spacetime curvature and advancing black hole astrophysics. However, due to limitations in observational resolution, high observational costs, and imbalanced distributions of positive and negative samples, black hole images often suffer from data scarcity, sparse parameter spaces, and complex structural characteristics. These factors pose sig…

Stochastic heat flow is a black noise
Yu Gu, Li-Cheng Tsai
https://arxiv.org/abs/2506.16484 https://arxiv.org/pdf/2506.16484

Stochastic heat flow is a black noise
We prove that the stochastic heat flow Caravenna Sun Zygouras (2023), Tsai (2024) is a black noise in the sense of Tsirelson (2004). As a corollary, the 2d stochastic heat equation driven by a mollified spacetime white noise becomes asymptotically independent of that noise in the scaling limit.

Lifshitz Quantum Mechanics and Anisotropic Josephson Junction
Chong-Sun Chu, Alfian Gunawan
https://arxiv.org/abs/2507.14996 https://…

Lifshitz Quantum Mechanics and Anisotropic Josephson Junction
We consider quantum mechanics in spacetime with time anisotropy. Such Lifshitz quantum mechanics is characterized by a kinetic term with fractional derivatives. We show that, contrary to popular belief, local conservation of probability is respected when the probability current is properly identified. As an application we consider a Josephson Junction with an anisotropic insulating layer. We show that anisotropy affects the tunneling rate and can greatly enhance the working of Josephson Junctio…

Asymmetry in momentum space: restoring CPT invariance of $\kappa$-field theory
Tadeusz Adach, Andrea Bevilacqua, Jerzy Kowalski-Glikman, Giacomo Rosati
https://arxiv.org/abs/2507.16187

Asymmetry in momentum space: restoring CPT invariance of $κ$-field theory
The positive and negative energy modes of a field theory in $κ$-Minkowski/$κ$-Poincaré noncommutative spacetime have very different symmetry properties. This can be understood geometrically by considering that they span two distinct sectors of a curved momentum space. It seems that because of this asymmetry, charge conjugation and Poincaré invariance are incompatible. However, the structure of momentum space suggests that time reversal could be deformed so that the overall CPT-invariance is…

Relativistic Fluid Dynamics in Curved Spacetime: a Novel Effective Hamiltonian Approach
Arpan Krishna Mitra, Subir Ghosh
https://arxiv.org/abs/2507.16444 h…

Relativistic Fluid Dynamics in Curved Spacetime: a Novel Effective Hamiltonian Approach
We present a comprehensive Eulerian (Hamiltonian) framework for relativistic fluid dynamics in curved spacetimes, with emphasis on Schwarzschild geometry. The key innovation lies in the consistent use of density and three-velocity fields, all defined in coordinate (Newtonian) time, while fully incorporating relativistic and curvature effects. {\it We stress that the entire dynamics is developed in coordinate (Eulerian) time, from the viewpoint of a static Eulerian observer.} In the non-relativi…

Magnetically Driven Retrograde Precession in Misaligned Black Hole Accretion Flows
Hong-Xuan Jiang, Yosuke Mizuno, Dong Lai, Indu K. Dihingia, Christian M. Fromm
https://arxiv.org/abs/2507.13680

Magnetically Driven Retrograde Precession in Misaligned Black Hole Accretion Flows
Observations of accreting black hole (BH) systems, such as microquasars and supermassive black holes, often reveal a precessing jet with changing directions, indicating a misaligned accretion flow relative to the BH spin. The precession is commonly attributed to the Lense-Thirring (LT) effect, which arises from the BH's rotation twisting the surrounding spacetime and accretion flow. In the strongly magnetized regime, which is preferred accretion flow conditions for M~87$^*$ and likely other jet…

Influence of dark matter on quantum entanglement and coherence in curved spacetime
Shu-Min Wu, Yu-Xuan Wang, Si-Han Shang, Wentao Liu
https://arxiv.org/abs/2507.16142

Influence of dark matter on quantum entanglement and coherence in curved spacetime
Dark matter (DM) remains undetected, and developing theoretical models such as the promising perfect fluid dark matter (PFDM) is a key challenge in modern cosmology. In this work, we investigate the quantum characteristics of PFDM by analyzing the behavior of quantum entanglement and coherence for both fermionic and bosonic fields near a Schwarzschild black hole embedded in a PFDM halo. Our results reveal that PFDM can either enhance or degrade quantum entanglement and coherence, depending sens…

Strong gravitational lensing by black hole in F(R) Euler Heisenberg Gravity's Rainbow
Sayan Naskar, Niyaz Uddin Molla, Ujjal Debnath
https://arxiv.org/abs/2507.13953

Strong gravitational lensing by black hole in F(R) Euler Heisenberg Gravity's Rainbow
We investigate gravitational lensing in the strong-field regime for a black hole in F(R) Euler Heisenberg Gravity with Rainbow gravity modifications. This black hole spacetime is characterized by the Euler Heisenberg parameter, F(R) parameters, Rainbow functions, the black hole charge Q, and mass M . We numerically compute the strong deflection angle and its associated coefficients, and explore their astrophysical implications for supermassive black holes in different galaxies. Our findings sho…

Spacetime Grand Unified Theory
Gon\c{c}alo M. Quinta
https://arxiv.org/abs/2507.11564 https://arxiv.org/pdf/2507.11564

Spacetime Grand Unified Theory
The Standard Model of particle physics is derived from first principles starting from the free Dirac Lagrangian. All known fermionic particle species plus three right handed neutrinos are obtained from ideals of a $C\ell_{8}$ algebra, with gauge symmetries arising as rotations of creation-annihilation operators and vacua. Triality originates both the strong force and three particle families with a mass hierarchy. Lorentz and gauge transformations are unified while avoiding the Coleman-Mandula t…

Observer Time from Causality in Perturbative Quantum Gravity
Allic Sivaramakrishnan
https://arxiv.org/abs/2506.16109 https://arxiv.or…

Observer Time from Causality in Perturbative Quantum Gravity
It is unclear whether an observable notion of time exists in quantum gravity even in principle because spacetime itself fluctuates. We propose a form of observable time in perturbative quantum gravity. First, we define an elapsed proper time in curved space using intersections of worldlines and future light cones. Here, time arises from causality via the dependence on light cones. We then propose that performing the gravitational path integral describes quantum gravity corrections to this notio…

Analogue simulation of quantum gravity black hole models in a dc-SQUID array
Marco D. Maceda, Carlos Sab\'in
https://arxiv.org/abs/2507.14150 https://

Analogue simulation of quantum gravity black hole models in a dc-SQUID array
We propose an analog quantum simulation for studying the collapse and bounce of a star from infinity. In this spacetime, which encompasses both a black hole and a white hole, we place a massless scalar field that propagates at the speed of light, which is modified by the curvature. We simulate this system using an SQUID array, in which we can alter the propagation of light using an external magnetic field. We consider both infalling and outfalling radiation, giving rise to two different scenari…

Lensing Fingerprints of Scalar Hair and Broken Symmetries via Three Semi-Analytical Methods
Ali \"Ovg\"un, Reggie C. Pantig
https://arxiv.org/abs/2507.16512

Lensing Fingerprints of Scalar Hair and Broken Symmetries via Three Semi-Analytical Methods
We present a detailed derivation of the weak-field deflection of light in the scalar hairy black hole spacetime with scalar charge $Q_s$ and bumblebee gravity black hole spacetime, characterized by a Lorentz-violating parameter $\ell$. Starting from the metric, we derive the photon orbit equation up to second order in the small parameters $M/b$, $Q_s$ or $\ell$. Then we derive the weak-field deflection angle via three independent semi-analytical techniques- (1) Homotopy-Perturbation Method, (2)…

$N=1$ Supersymmetry invariance of the Abelian Stueckelberg model
M. A. L. Capri, D. R. Granado, I. F. Justo, L. S. S. Mendes
https://arxiv.org/abs/2506.17021

$N=1$ Supersymmetry invariance of the Abelian Stueckelberg model
In this paper we investigate the invariance of the Abelian Stueckelberg-like model under gauge and $N=1$ supersymmetric (SUSY) transformations in (3+1) spacetime. We show that the Stueckelberg-like mass term explicitly breaks $N=1$ supersymmetry under the Wess-Zumino (WZ) gauge condition. Nevertheless, we demonstrate that the WZ gauge is not needed in order to construct an action independent of compensating fields, manifestly supersymmetric and gauge invariant.

Emergent field theory
Erick I. Duque
https://arxiv.org/abs/2507.16163 https://arxiv.org/pdf/2507.16163…

Emergent field theory
The uniqueness theorems for general relativity and Yang-Mills theories can be circumvented by dropping the ubiquitous, yet often implicit, assumption that physical fields, such as the spacetime metric, are fundamental. The novel concept of emergent fields makes it possible to construct modified theories of gravity and forces where the spacetime metric and strength tensor fields emerge from a covariance analysis in the canonical formulation with nontrivial relations to the fundamental phase spac…

Effective field theory for superfluid vortex lattice from coset construction
Aleksander G\l\'odkowski, Sergej Moroz, Francisco Pe\~na-Ben\'itez, Piotr Sur\'owka
https://arxiv.org/abs/2507.13352

Effective field theory for superfluid vortex lattice from coset construction
Guided by symmetry principles, we construct an effective field theory that captures the long-wavelength dynamics of two-dimensional vortex crystals observed in rotating Bose-Einstein condensates trapped in a harmonic potential. By embedding the system into Newton--Cartan spacetime and analyzing its isometries, we identify the appropriate spacetime symmetry group for trapped condensates at finite angular momentum. After introducing a coarse-grained description of the vortex lattice we consider a…

Numerical analysis of quasiperiodic oscillations in the Hartle-Thorne spacetime
K. Boshkayev, T. Konysbayev, Ye. Kurmanov, M. Muccino, H. Quevedo
https://arxiv.org/abs/2506.11581 …

Numerical analysis of quasiperiodic oscillations in the Hartle-Thorne spacetime
We numerically analyze quasiperiodic oscillations (QPOs) using a well-established spacetime model with neutron star sources. Within the framework of general relativity, we present expressions for the fundamental frequencies of test particles in the gravitational field of a slowly rotating and slightly deformed compact object defined by the Hartle-Thorne (HT) metric. Using the Relativistic Precession Model (RPM) formulated by Stella and Morinsk, we examine quasiperiodic oscillation data from eig…

On the One-Loop Exactness of Gravity Partition Function
Andres Goya, Mauricio Leston, Mario Passaglia
https://arxiv.org/abs/2507.16141 https://

On the One-Loop Exactness of Gravity Partition Function
In a previous work, we showed that the two- and three-loop contributions to the partition function of three-dimensional gravity in flat space vanish. This is in agreement with the expected one-loop exactness dictated by the underlying symmetry at the quantum level. To highlight the distinctive nature of the $D=3$ case, we extend the three-loop computation to arbitrary spacetime dimensions $D$. In higher dimensions, the number of contributions increases substantially, reinforcing the view that o…

Spacetime symmetry-enriched SymTFT: from LSM anomalies to modulated symmetries and beyond
Salvatore D. Pace, \"Omer M. Aksoy, Ho Tat Lam
https://arxiv.org/abs/2507.02036

Spacetime symmetry-enriched SymTFT: from LSM anomalies to modulated symmetries and beyond
We extend the Symmetry Topological Field Theory (SymTFT) framework beyond internal symmetries by including geometric data that encode spacetime symmetries. Concretely, we enrich the SymTFT of an internal symmetry by spacetime symmetries and study the resulting symmetry-enriched topological (SET) order, which captures the interplay between the spacetime and internal symmetries. We illustrate the framework by focusing on symmetries in 1+1D. To this end, we first analyze how gapped boundaries of 2…

This https://arxiv.org/abs/2412.01012 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Optimal transport and regularity of weak Kantorovich potentials on a globally hyperbolic spacetime
We consider the optimal transportation problem on a globally hyperbolic spacetime for some cost function $c_2$, which corresponds to the optimal transportation problem on a complete Riemannian manifold where the cost function is the Riemannian distance squared. Building on insights from previous studies on the Riemannian and Lorentzian case, our main goal is to investigate the regularity of $π$-solutions (weak versions of Kantorovich potentials), from which we can conclude, in a classical way,…

DESI results and Dark Energy from QCD topological sectors
Ludovic Van Waerbeke, Ariel Zhitnitsky
https://arxiv.org/abs/2506.14182 https://

DESI results and Dark Energy from QCD topological sectors
We present a physically motivated model of dark energy (DE) rooted in the topological structure of the Quantum ChromoDynamic (QCD) vacuum. In this framework, DE emerges as the Universe expands, from the difference in vacuum energy between the expanding Universe and Minkowski spacetime, driven by QCD vacuum topological sectors. This leads to a modification of the dark energy term in the Friedmann equation, which then scales with the Hubble parameter as $ρ_{\rm DE}(t) \propto H(t)$ when dark ene…

Non-Linear Dynamics and Critical Phenomena in the Aretakis Instability of Extremal Black p-Branes
Behnam Pourhassan
https://arxiv.org/abs/2507.16023 https:…

Non-Linear Dynamics and Critical Phenomena in the Aretakis Instability of Extremal Black p-Branes
We present the first comprehensive investigation of the non-linear evolution of the Aretakis instability in extremal black $p$-branes. Building on recent insights into the linear behavior of perturbations in near-horizon AdS$_{p+2} \times S^{D-p-2}$ geometries, we explore the full non-linear regime using a combination of analytical scaling arguments and numerical simulations. We uncover a universal critical behavior governed by scaling exponents that depend only on the spacetime dimension $D$ a…

Affine Deformations of Divisible Convex Cones and Affine Spacetimes
Antoine Ablondi
https://arxiv.org/abs/2506.12172 https://arxiv.or…

Affine Deformations of Divisible Convex Cones and Affine Spacetimes
Given a subgroup of $\mathrm{SL}(\mathbb{R}^{d+1})\ltimes\mathbb{R}^{d+1}$ obtained by adding a translation part to a torsion-free discrete subgroup of $\mathrm{SL}(\mathbb{R}^{d+1})$ dividing a convex domain in the sense of Benoist, we construct two maximal convex domains on which the affine action of that subgroup is free and properly continuous. We also introduce a notion of "affine spacetime" structure, with which quotients of those domains are naturally endowed. In that setting, we show th…

Scalable Spatiotemporal Modeling for Bicycle Count Prediction
Rishikesh Yadav, Alexandra M. Schmidt, Aurelie Labbe, Pratheepa Jeganathan, Luis F. Miranda-Moreno
https://arxiv.org/abs/2506.07582

Scalable Spatiotemporal Modeling for Bicycle Count Prediction
We propose a novel sparse spatiotemporal dynamic generalized linear model for efficient inference and prediction of bicycle count data. Assuming Poisson distributed counts with spacetime-varying rates, we model the log-rate using spatiotemporal intercepts, dynamic temporal covariates, and site-specific effects additively. Spatiotemporal dependence is modeled using a spacetime-varying intercept that evolves smoothly over time with spatially correlated errors, and coefficients of some temporal co…

A remarkable dynamical symmetry of the Landau problem
Tekin Dereli, Philippe Nounahon, Todor Popov
https://arxiv.org/abs/2506.11642 https://

A remarkable dynamical symmetry of the Landau problem
We show that the dynamical group of an electron in a constant magnetic field is the group of symplectomorphisms $Sp(4,\mathbb{R})$. It is generated by the spinorial realization of the conformal algebra $\mathfrak{so}(2,3)$ considered in Dirac's seminal paper "A Remarkable Representation of the 3 + 2 de Sitter Group". The symplectic group $Sp(4,\mathbb{R})$ is the double covering of the conformal group $SO(2,3)$ of 2+1 dimensional Minkowski spacetime which is in turn the dynamical group of a hyd…

Einstein causality of quantum measurements in the Tomonaga-Schwinger picture
Samuel Fedida
https://arxiv.org/abs/2506.14693 https://a…

Einstein causality of quantum measurements in the Tomonaga-Schwinger picture
When quantum measurements are conducted over spacelike-separated regions of spacetime, a natural and commonly assumed physical postulate, called Einstein causality, asserts that they should commute. In this paper, we provide a generalisation to Lüders' rule à la Aharonov-Albert in those globally hyperbolic spacetimes which allow unitarily equivalent Hilbert spaces to be defined along Cauchy hypersurfaces, thus relying on the existence of an interaction picture à la Tomonaga-Schwinger. We sho…

Dynamical analog spacetimes from nonlinear perturbations in a topological material
Surajit Das, Surojit Dalui, Hrishit Banerjee, Arpan Krishna Mitra
https://arxiv.org/abs/2507.16570

Dynamical analog spacetimes from nonlinear perturbations in a topological material
Emergent spacetime analogs in condensed matter systems have opened a fascinating window into simulating aspects of gravitational physics in controlled laboratory environments. In this work, we develop a comprehensive nonlinear analog gravity framework within a topological material, incorporating the impact of Berry curvature on the hydrodynamic flow of electrons. Unlike prevalent studies in existing literature limited to linear perturbations, we derive and analyze a fully nonlinear wave equatio…

Rotating frames from quantum deformed spacetime
Du\v{s}an {\DJ}or{\dj}evi\'c, Dragoljub Go\v{c}anin
https://arxiv.org/abs/2507.11637 https://

Rotating frames from quantum deformed spacetime
In a sense of deformation quantization, noncommutative (NC) geometry introduces a quantum structure of spacetime. Using the twist-deformation formalism, we show that the dynamical effects of spacetime noncommutativity can amount to a transition to a rotating frame of reference. In particular, we study the dynamics of charged matter (scalars and spinors) on the background of Melvin's electric universe in the framework of NC gauge field theory. Melvin's electric/magnetic universe is a static, axi…

Theories of the gravity gauge type in de Sitter space
Julian Lang, Yasha Neiman
https://arxiv.org/abs/2506.16707 https://arxiv.org/pd…

Theories of the gravity+gauge type in de Sitter space
We study theories of the "General Relativity + Yang-Mills" type in 4d spacetime with cosmological constant, focusing on formulations where the basic variables are connections and curvatures (but no metric). We present a new Lagrangian for GR coupled to Yang-Mills, which uses the same kind of variables for both sectors, and has a manifest double-copy structure. This Lagrangian comes in both non-chiral (real) and chiral (complex) versions. The chiral version makes it easy to isolate the self-dual…

Gravitational Wave Signals in a Promising Realization of SO(10) Unification
Injun Jeong (Center for Quantum Spacetime, Sogang University, Department of Physics, Sogang University), J\"orn Kersten (Department of Physics and Technology, University of Bergen, Department of Physics and IPAP, Yonsei University), Stefano Scopel (Center for Quantum Spacetime, Sogang University, Department of Physics, Sogang University), Liliana Velasco-Sevilla (Center for Quantum Spacetime, Sogang Univer…

Gravitational Wave Signals in a Promising Realization of SO(10) Unification
We investigate gravitational wave signals in a non-supersymmetric grand unified model where the group $SO(10)$ is broken in two steps to the Standard Model gauge group. We calculate the analytical form of the one-loop effective potential responsible for the first step of symmetry breaking and show that it can lead to a first-order phase transition with gravitational wave production. We also determine the gravitational wave background produced by the primordial plasma of relativistic particles. …

Ultrarelativistic limit of the Kerr theorem
Eloy Ay\'on-Beato, Daniel Flores-Alfonso, Mokhtar Hassaine
https://arxiv.org/abs/2507.16094 https://…

Ultrarelativistic limit of the Kerr theorem
The original Kerr theorem provides the foundation for Kerr-Schild transformations by classifying all shear-free and geodesic null congruences in flat spacetime; the key ingredient of the Kerr-Schild ansatz. However, due to the high level of degeneracy of the outcome it is often less practical than its symmetric refinements, which may single out congruences leading to physically significant spacetimes by imposing relevant symmetries. An illustrative example is the stationary axisymmetric version…

Weak null singularity for the Einstein-Euler system
Yuefeng Song
https://arxiv.org/abs/2506.16635 https://arxiv.org/pdf/2506.16635

Weak null singularity for the Einstein-Euler system
We study the behavior of a self-gravitating perfect relativistic fluid satisfying the Einstein-Euler system in the presence of a weak null terminal spacetime singularity. This type of singularities is expected in the interior of generic dynamical black holes. In the vacuum case, weak null singularities have been constructed locally by Luk, where the metrics extend continuously to the singularities while the Christoffel symbols fail to be square integrable in any neighborhood of any point on the…

Entangled Unruh-DeWitt detectors amplify quantum coherence
Shu-Min Wu, Yu-Xuan Wang, Wentao Liu
https://arxiv.org/abs/2506.14115 https://

Entangled Unruh-DeWitt detectors amplify quantum coherence
We explore the quantum coherence between a pair of entangled Unruh-DeWitt detectors, interacting with a quantum field, using a nonperturbative approach in a (3+1)-dimensional Minkowski spacetime with instantaneous switching ($δ$-switching). It is intriguing to observe that for a maximally entangled state, increasing the coupling strength enhances the detectors' initial quantum coherence while simultaneously causing a monotonic decrease in their initial entanglement. This reveals a remarkable p…

Evolving Wormholes in a Cosmological Background
Mahdi Kord Zangeneh, Francisco S. N. Lobo
https://arxiv.org/abs/2507.14750 https://ar…

Evolving Wormholes in a Cosmological Background
Wormholes are non-trivial topological structures that arise as exact solutions to Einstein's field equations, theoretically connecting distinct regions of spacetime via a throat-like geometry. While static traversable wormholes necessarily require exotic matter that violates the classical energy conditions, subsequent studies have sought to minimize such violations by introducing time-dependent geometries embedded within cosmological backgrounds. This review provides a comprehensive survey of e…

Deep learning inference with the Event Horizon Telescope I. Calibration improvements and a comprehensive synthetic data library
M. Janssen, C. -k. Chan, J. Davelaar, I. Natarajan, H. Olivares, B. Ripperda, J. R\"oder, M. Rynge, M. Wielgus
https://arxiv.org/abs/2506.13873

Deep learning inference with the Event Horizon Telescope I. Calibration improvements and a comprehensive synthetic data library
(abridged) In a series of publications, we describe a comprehensive comparison of Event Horizon Telescope (EHT) data with theoretical models of Sgr A* and M87*. Here, we report on improvements made to our observational data reduction pipeline and present the generation of observables derived from the EHT models. We make use of ray-traced GRMHD simulations that are based on different black hole spacetime metrics and accretion physics parameters. These broad classes of models provide a good repre…

Can Static Black Holes in Massive Gravity Serve as Candidates for Aschenbach-Like Phenomena?
Mohammad Ali S. Afshar, Jafar Sadeghi, Tahereh Azizi, A. S. Sefiedgar
https://arxiv.org/abs/2507.15563

Can Static Black Holes in Massive Gravity Serve as Candidates for Aschenbach-Like Phenomena?
The Aschenbach effect is widely regarded as a manifestation of two quintessential relativistic features: frame dragging and extreme spacetime curvature. Traditionally associated with rotating geometries, this non-monotonic behavior in orbital angular velocity challenges Newtonian intuition. In our previous work, however, we demonstrated that this velocity irregularity is not exclusive to spinning spacetimes. Specifically, we showed that the presence of a stable minimum in the gravitational pote…

Quantum droplets in curved space
Antonino Flachi, Takahiro Tanaka
https://arxiv.org/abs/2507.13682 https://arxiv.org/pdf/2507.13682…

Quantum droplets in curved space
This paper investigates the formation of quantum droplets in curved spacetime, highlighting the significant influence of curvature on the formation and properties of these objects. While our computations encompass various dimensions, we primarily focus on 2-dimensions. Our findings reveal a novel class of curvature-driven quantum effects leading to the formation of quasi-stable liquid droplets, suggesting a feasible pathway for experimental observation, particularly in microgravity environments.

A non-linear damping structure and global stability of wave-Klein-Gordon coupled system in $\RR^{3 1}$
Yue Ma, Weidong Zhang
https://arxiv.org/abs/2507.12285

A non-linear damping structure and global stability of wave-Klein-Gordon coupled system in $\RR^{3+1}$
This paper establishes the global existence of solutions for a class of wave-Klein-Gordon coupled systems with specific nonlinearities in 3+1-dimensional Minkowski spacetime. The study demonstrates that imposing certain constraints on the coefficients of these specific nonlinear terms induces a damping effect within the system, which is crucial for proving the global existence of solutions. The proof is conducted within the framework of a bootstrap argument, primarily employing the hyperboloida…

Learning Null Geodesics for Gravitational Lensing Rendering in General Relativity
Mingyuan Sun, Zheng Fang, Jiaxu Wang, Kunyi Zhang, Qiang Zhang, Renjing Xu
https://arxiv.org/abs/2507.15775

Learning Null Geodesics for Gravitational Lensing Rendering in General Relativity
We present GravLensX, an innovative method for rendering black holes with gravitational lensing effects using neural networks. The methodology involves training neural networks to fit the spacetime around black holes and then employing these trained models to generate the path of light rays affected by gravitational lensing. This enables efficient and scalable simulations of black holes with optically thin accretion disks, significantly decreasing the time required for rendering compared to tra…

Manifestation of Quantum Forces in Spacetime: Towards a General Theory of Quantum Forces
Raheem Adom
https://arxiv.org/abs/2507.07332 https://

Manifestation of Quantum Forces in Spacetime: Towards a General Theory of Quantum Forces
This study introduces the quantum force wave equation (QFWE) as a general theory of quantum forces, a novel framework that redefines quantum forces as emergent phenomena arising from the interaction between quantum particles and curved spacetime. By coupling wavefunctions to spacetime curvature and gauge fields, the theory establishes a dynamic, bidirectional relationship between quantum states and spacetime geometry. This approach provides a unified description of quantum forces in highly curv…

Probing the singularity at the holographic screen via $q$-holography
Andreas Belaey, Thomas G. Mertens, Jacopo Papalini
https://arxiv.org/abs/2507.13873 ht…

Probing the singularity at the holographic screen via $q$-holography
We study the emergence of $q$-deformed spacetime in a lower-dimensional gravitational system whose asymptotic region geometrizes the global symmetry of a $q$-deformed CFT. More precisely, we consider the 2d sinh dilaton gravity model, whose classical metric solutions exhibit a curvature singularity at the holographic boundary. Our aim is to probe this UV near-boundary regime by injecting a small probe into the bulk, and identifying the geometrical features it observes. At the level of the two-p…

Kaluza-Klein inspired a model of the inflation with the inversed power law potential in Bianchi type-I universe
Jaturaporn Wattanakumpolkij, Patinya Ma-ardlerd, Natthason Autthisin, Pornpatara Chuvala, Nutthaphat Lunrasri, Chakrit Pongkitivanichkul, Daris Samart
https://arxiv.org/abs/2506.16139

Kaluza-Klein inspired a model of the inflation with the inversed power law potential in Bianchi type-I universe
This work considers the dynamics of the gauge vector and inflaton (dilaton) fields inspired by Kaluza-Klein theory in an inflationary universe with Bianchi type-I spacetime. The inverse power-law potential of the inflaton field is used to study dynamical system analysis. As a result, all fixed points in the autonomous system are non-hyperbolic fixed points, and one cannot determine their stability. Therefore, a center manifold theory is required to analyze the stability of the dynamical system …

Gravity and the Higgs boson mass
Carlo Branchina, Vincenzo Branchina, Filippo Contino, Riccardo Gandolfo, Arcangelo Pernace
https://arxiv.org/abs/2507.13832

Gravity and the Higgs boson mass
According to usual calculations in quantum field theory, both in flat and curved spacetime, the mass $m^2$ of a scalar particle is quadratically sensitive to the ultimate scale of the theory, the UV physical cutoff $Λ$. In the present work, paying attention to the path integral measure and to the way $Λ$ is introduced, we calculate the one-loop effective action $Γ^{1l}$ for a scalar field on a non-trivial gravitational background. We find that $m^2$ presents only a (mild) logarithmic sensiti…

Weak Field Limit of the Nonminimally Coupled Weyl Connection Gravity
Cl\'audio Gomes
https://arxiv.org/abs/2506.16532 https://arx…

Weak Field Limit of the Nonminimally Coupled Weyl Connection Gravity
The true nature of gravity is a remarkable open problem in Gravitation. Theoretical and observational motivations open the avenue of alternative theories of gravity. One possibility resorts to nonminimal couplings and non-metricity properties of spacetime, and is dubbed as nonminimally coupled Weyl connection gravity. It has the advantage of leading to metric field equations of second order together with a constraint equation for the Weyl vector, and has well behaved space-form. We analyse this…

Testing Quantum-Corrected Black Holes with QPOs Observations: A Study of Particle Dynamics and Accretion Flow
G. Mustafa, Sushant G. Ghosh, Orhan Donmez, S. K. Maurya, Shakhzod Orzuev, Farruh Atamurotov
https://arxiv.org/abs/2506.16405

Testing Quantum-Corrected Black Holes with QPOs Observations: A Study of Particle Dynamics and Accretion Flow
We study the epicyclic oscillations of test particles around rotating quantum-corrected black holes (QCBHs), characterized by mass $M$, spin $a$, and quantum deformation parameter $b$. By deriving the radial ($Ω_r$) and vertical ($Ω_θ$) oscillation frequencies, we explore their dependence on spacetime parameters and show that quantum corrections ($b \neq 0$) significantly modify the dynamics compared to the classical Kerr case. Through numerical modelling of accretion around QCBHs, we furthe…

Search for Quantum Decoherence with 10.7 years of atmospheric $\nu_\mu$ events in IceCube
Tanvi Krishnan (for the IceCube Collaboration)
https://arxiv.org/abs/2507.12316

Search for Quantum Decoherence with 10.7 years of atmospheric $ν_μ$ events in IceCube
In order to develop a consistent quantum theory of gravity, we must understand the nature of spacetime at the Planck scale. In particular if it exhibits quantum fluctuations, they may cause propagating particles to evolve in an apparently non-unitary manner. Neutrinos, which interact only via the weak force and gravity, maintain quantum coherence while propagating over large distances. Thus, neutrino oscillations serve as a precise interferometer to search for Planck-scale fluctuations of space…

Orthogonal splitting of the Riemann curvature tensor and its implications in modeling compact stellar structures
A. Rehman, Tayyab Naseer, Nazek Alessa, Abdel-Haleem Abdel-Aty
https://arxiv.org/abs/2506.16725

Orthogonal splitting of the Riemann curvature tensor and its implications in modeling compact stellar structures
Although the interpretation of complexity in extended theories of gravity is available in the literature, its illustration in $f(R,L_{m},\mathcal{T})$ theory is still ambiguous. The orthogonal decomposition of the Riemann tensor results in the emergence of complexity factor as recently proposed by Herrera [1]. We initiate the analysis by contemplating the interior spacetime as a static spherical anisotropic composition under the presence of charge. The modified field equations are derived along…

The thermal backreaction of a scalar field in de Sitter spacetime
Nikos Irges, Antonis Kalogirou, Fotis Koutroulis
https://arxiv.org/abs/2507.08774 https:/…

The thermal backreaction of a scalar field in de Sitter spacetime
We argue that a scalar field in de Sitter spacetime should feel explicit thermal effects associated with its curvature. Starting from the Bunch-Davies vacuum and a scalar field with small mass compared to the de Sitter curvature, we use the thermo-field dynamics formalism in order to expose these thermal effects. We compute the thermal Wightman function connecting two spacetime points and from it, via the point-splitting regularization technique, the renormalized thermal energy-momentum tensor.…

Neutrino oscillations in the Ellis wormhole spacetime
Ya-Ru Wang, Shu-Jun Rong
https://arxiv.org/abs/2506.23905 https://arxiv.org/pdf…

Neutrino oscillations in the Ellis wormhole spacetime
Gravitational lensing is a powerful tool to probe compact astrophysical objects and the distribution of dark matter at large scales. As a counterpart of photons, lensed relativistic neutrinos could also be used to explore properties of curved spacetimes. In the present paper we consider neutrino oscillations in the Ellis wormhole (WH) spacetime in comparison with the widely discussed black hole (BH) spacetimes. We investigate the oscillations involving lensing effects with 2- and 3-flavor neutr…

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…

This https://arxiv.org/abs/2412.00193 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qu…

Spacetime Markov length: a diagnostic for fault tolerance via mixed-state phases
We establish a correspondence between the fault-tolerance of local stabilizer codes experiencing measurement and physical errors and the mixed-state phases of decohered resource states in one higher dimension. Drawing from recent developments in mixed-state phases of matter, this motivates a diagnostic of fault-tolerance, which we refer to as the spacetime Markov length. This is a length scale determined by the decay of the (classical) conditional mutual information of repeated syndrome measure…

Challenges for describing unitary evolution in nontrivial geometries: pictures and representations
Steven B. Giddings, Julie Perkins
https://arxiv.org/abs/2507.13351

Challenges for describing unitary evolution in nontrivial geometries: pictures and representations
Description of evolution between spatial slices in a general spacetime suffers from a significant difficulty: the states on the slices, in a given basis, are not related by a unitary transformation. This problem, which occurs in spacetime dimensions above two, is directly related to the infinite number of inequivalent representations of the canonical commutators, and in particular will arise for interacting theories in time-dependent spacetimes. We connect different facets of this issue, and di…

Bulk Spacetime Encoding via Boundary Ambiguities
Zhenkang Lu, Cheng Ran, Shao-feng Wu
https://arxiv.org/abs/2506.12890 https://arxiv.…

Bulk Spacetime Encoding via Boundary Ambiguities
We propose a method to reconstruct the exterior of a static, planar-symmetric black hole from an infinite set of discrete momentum-space locations, known as pole-skipping points, where the boundary Green's function becomes ambiguous. The reconstruction is fully analytical and involves solving only linear equations. It further enables a reinterpretation of any pure gravitational field equation in pole-skipping data. Moreover, our method reveals that the pole-skipping points are redundant: only a…

Quantum Effective Dynamics of Papapetrou Spacetime
Xiaokan Guo, Faqiang Yuan
https://arxiv.org/abs/2506.08821 https://arxiv.org/pdf/2…

Quantum Effective Dynamics of Papapetrou Spacetime
In this paper, we investigate the quantum effective dynamics of Papapetrou spacetime by using methods from loop quantum gravity. The Papapetrou spacetime is an extension of the Schwarzschild spacetime with an extra coupled anti-scalar field. By solving the equations of motion generated by the Hamiltonian constraint for Papapetrou spacetime, we can construct the quantum effective metric. The resulting effective metric for the quantum-corrected Papapetrou spacetime demonstrates the quantum effect…

Routing Quantum Control of Causal Order
Maarten Grothus, Alastair A. Abbott, Augustin Vanrietvelde, Cyril Branciard
https://arxiv.org/abs/2507.08781 https:…

Routing Quantum Control of Causal Order
In recent years, various frameworks have been proposed for the study of quantum processes with indefinite causal order. In particular, quantum circuits with quantum control of causal order (QC-QCs) form a broad class of physical supermaps obtained from a bottom-up construction and are believed to represent all quantum processes physically realisable in a fixed spacetime. Complementarily, the formalism of routed quantum circuits introduces quantum operations constrained by "routes" to represent …

Emergent Holographic Spacetime from Quantum Information
Tadashi Takayanagi
https://arxiv.org/abs/2506.06595 https://arxiv.org/pdf/250…

Emergent Holographic Spacetime from Quantum Information
Holographic duality describes gravitational theories in terms of quantum many-body systems. In holography, quantum information theory provides a crucial tool that directly connects microscopic structures of these systems to the geometries of gravitational spacetimes. One manifestation is that the entanglement entropy in quantum many-body systems can be calculated from the area of an extremal surface in the corresponding gravitational spacetime. This implies that a gravitational spacetime can em…

Electrodynamics in curved spacetime: Gravitationally-induced constitutive equations and the spacetime index of refraction
F. Masghatian, M. Esfandiar, M. Nouri-Zonoz
https://arxiv.org/abs/2507.06475

Electrodynamics in curved spacetime: Gravitationally-induced constitutive equations and the spacetime index of refraction
Previous studies on spacetime index of refraction are mostly restricted to the static spacetimes. In this study we fill this gap by introducing the refractive index for full stationary spacetimes, employing three different approaches. These include applying Fermat's principle, employing the classical definition of refractive index, and using gravitationally-induced constitutive equations. These calculations are carried out in both threading and slicing spacetime decomposition formalisms, and th…

Transverse relative locality effects in de Sitter spacetime
Giuseppe Fabiano, Domenico Frattulillo
https://arxiv.org/abs/2507.13192 https://

Transverse relative locality effects in de Sitter spacetime
Doubly Special Relativity (DSR) models are characterized by the deformation of relativistic symmetries at the Planck scale and constitute one of the cornerstones for quantum gravity phenomenology research, due to the possibility of testing them with cosmological messengers. Some of their predictions manifest themselves as relative locality effects, implying that events local to an observer might not appear to be so for a distant one. In this work we focus on transverse relative locality models,…

Null infinity as an inverted extremal horizon: Matching an infinite set of conserved quantities for gravitational perturbations
Shreyansh Agrawal, Panagiotis Charalambous, Laura Donnay
https://arxiv.org/abs/2506.15526

Null infinity as an inverted extremal horizon: Matching an infinite set of conserved quantities for gravitational perturbations
Every spacetime that is asymptotically flat near null infinity can be conformally mapped via a spatial inversion onto the geometry around an extremal, non-rotating and non-expanding horizon. We set up a dictionary for this geometric duality, connecting the geometry and physics near null infinity to those near the dual horizon. We then study its physical implications for conserved quantities for extremal black holes, extending previously known results to the case of gravitational perturbations. …

Analytical solutions of CPT-odd Maxwell equations in Schwarzschild spacetime
Hao Wang, Zhi Xiao, Bing Sun
https://arxiv.org/abs/2506.10409 https://

Analytical solutions of CPT-odd Maxwell equations in Schwarzschild spacetime
In this work, we present the CPT-violating (CPTV) Maxwell equations in curved spacetime using the Newman-Penrose (NP) formalism. We obtain a semi-analytical solution to the Maxwell equations in Schwarzschild spacetime under the assumption that the CPT-odd $\left(k_{AF}\right)^μ$ term exhibits spherical symmetry in the Schwarzschild background. Retaining only terms up to linear order in the $\left(k_{AF}\right)^μ$ coefficient, we obtain perturbative solutions by treating the solutions of the L…

Cosmological evolution driven by polytropic fluids in an inhomogeneous spacetime
Gilberto Aguilar-P\'erez, Miguel Cruz, Mohsen Fathi, Daniel de Jes\'us Garc\'ia-Castro, J. R. Villanueva
https://arxiv.org/abs/2507.11800

Cosmological evolution driven by polytropic fluids in an inhomogeneous spacetime
Addressing the late-time accelerated expansion of the universe, known as the ``dark energy problem'', remains a central challenge in cosmology. While the cosmological constant is the standard explanation, alternative models such as quintessence, phantom fluids, and Chaplygin gas have been proposed. This work investigates the generalized Chaplygin gas (GCG) model, which is characterized by a polytropic equation of state. We explore this model within the framework of an anisotropic fluid, by mean…

Triangulating quantum gravity in AdS$_3$
Thomas Hartman
https://arxiv.org/abs/2507.12696 https://arxiv.org/pdf/2507.12696

Triangulating quantum gravity in AdS$_3$
The path integral of pure 3D gravity with negative cosmological constant is formulated on a finite region of spacetime $M$, with boundary conditions that fix geodesic lengths or dihedral angles on $\partial M$. In the dual CFT, this quasi-local amplitude calculates corrections to the Gaussian ensemble of OPE coefficients for black hole states. By triangulating $M$ with generalized tetrahedra, we develop a general method to construct semiclassical geometries and to calculate the exact gravitatio…

Penrose process in magnetized non-Kerr rotating spacetime with anomalous quadrupole moment
Shao-Jun Zhang
https://arxiv.org/abs/2507.08401 https://

Penrose process in magnetized non-Kerr rotating spacetime with anomalous quadrupole moment
We investigate the magnetic Penrose process in the Quevedo-Mashhoon spacetime, immersed in a uniform magnetic field $B$. This metric is a stationary, axisymmetric, asymptotically flat vacuum solution to Einstein's equations with an arbitrary anomalous quadrupole moment ${\cal Q}$. A non-vanishing ${\cal Q}$ significantly modifies the near-horizon geometry, creating a multi-lobe ergoregion. Both ${\cal Q}$ and $B$ strongly influence the negative-energy region, which can extend well beyond the er…

Periapsis shift in the Zipoy-Voorhees spacetime
Akihito Katsumata, Tomohiro Harada
https://arxiv.org/abs/2507.04280 https://arxiv.org…

Periapsis shift in the Zipoy-Voorhees spacetime
We study the periapsis shift of timelike bound orbits in the Zipoy-Voorhees spacetime, which is an exact, static, axisymmetric, and vacuum solution characterized by the deformation parameter $γ$, including the Schwarzschild spacetime as $γ=1$. We derive both the exact formula for the periapsis shift of a quasi-circular orbit and the formula for the periapsis shift by the post-Newtonian (PN) expansion. We show that the periapsis shift in the Zipoy-Voorhees spacetime for $1/11 < γ\leq 1/5$ is …

Strongly Coupled Quantum Field Theory in Anti-de Sitter Spacetime
Jon\'a\v{s} Dujava
https://arxiv.org/abs/2507.07111 https://arx…

Strongly Coupled Quantum Field Theory in Anti-de Sitter Spacetime
We introduce the framework of Quantum Field Theories in general backgrounds through the lens of the path integral, in the formulation known as the Functorial QFT. With the aim of studying properties of strongly coupled QFTs, we present key concepts and techniques such as the effective action, renormalization group flow, and the 1/N expansion. At the fixed points of the RG flow we typically find Conformal Field Theories, which are symmetric under local rescaling of the metric. Among other thin…

Lorentz violation signatures in the low-energy sector of Ho\v{r}ava gravity from black hole shadow observations
Wentao Liu, Hongxia Huang, Di Wu, Jieci Wang
https://arxiv.org/abs/2506.13504

Lorentz violation signatures in the low-energy sector of Hořava gravity from black hole shadow observations
In this paper, we use the Hořava gravity model and EHT observations of supermassive black holes (BHs) to investigate signatures of Lorentz violation in real astrophysical environments. The Lorentz violation in the rotating Hořava BH spacetime are confined to the strong gravitational field region, being induced by the BH's rotation. Due to the non-separability of the photon motion equations in this spacetime, we employed a numerical backward ray-tracing method to generate shadow images for var…

The asymptotically-free gauge theories
Ben Gripaios, Khoi Le Nguyen Nguyen
https://arxiv.org/abs/2507.12348 https://arxiv.org/pdf/250…

The asymptotically-free gauge theories
We show how to classify the asymptotically-free gauge theories in four spacetime dimensions, focussing here on the case of purely fermionic matter. The classification depends on the fact (which we prove) that both the dimension and Dynkin index of irreducible representations of a simple Lie algebra are strictly increasing functions of each Dynkin label. This implies not only that the number of asymptotically-free representations of any one semisimple Lie algebra is finite, but also that they ca…

This https://arxiv.org/abs/2505.00761 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

What is a photon in de Sitter spacetime?
The states of a single photon in four-dimensional de Sitter (dS) spacetime form a Unitary Irreducible Representation (UIR) of SO(1,4), which we call the photon UIR. While in flat spacetime photons are intimately tied to gauge symmetry, we demonstrate that in de Sitter, photon states emerge generically in any quantum field theory, even without an underlying U(1) gauge field. We derive a Källén-Lehmann representation for antisymmetric tensor two-point functions and show that numerous composite …

Replaced article(s) found for hep-th. https://arxiv.org/list/hep-th/new
[2/2]:
- Spin Precession in magnetized Kerr spacetime
Karthik Iyer (MCNS, India), Chandrachur Chakraborty (MCNS, India)

Coupling Electromagnetism to Torsion: Black Holes and Spin-Charge Interactions
Sebastian Bahamonde, Jorge Maggiolo, Christian Pfeifer
https://arxiv.org/abs/2507.02362

Coupling Electromagnetism to Torsion: Black Holes and Spin-Charge Interactions
The coupling between matter fields and gravity (encoded in the geometry of spacetime) can be realized in various ways. Most commonly, a minimal coupling principle is employed, meaning that all matter fields, except spinors, couple only to the spacetime metric, while spinors additionally couple to the spacetime connection. Non-minimal couplings between matter fields and spacetime curvature can arise, for example, from quantum field theory on curved spacetime through renormalization corrections, …

Black holes in $f(R,T)$ gravity coupled with Euler-Heisenberg electrodynamics
Yizhi Liang, Jun Tao, Rui Yang
https://arxiv.org/abs/2506.14860 https://

Black holes in $f(R,T)$ gravity coupled with Euler-Heisenberg electrodynamics
We investigate the scenario of black holes coupled with the Euler-Heisenberg nonlinear electromagnetic field in the framework of $f(R,T)$ gravity. The black hole solutions for electrically charged, magnetically charged and the dyonic case are separately analyzed, and we discuss the scalar curvature and the energy conditions of the black hole spacetime. In the magnetic charge solution, the $f(R,T)$ correction appears in the $1/r^6$ Euler-Heisenberg electromagnetic field correction term, while th…

The New Black Hole Solution with Anisotropic Fluid in f(R,Lm, T) Gravity: Thermodynamics
Aniruddha Ghosh, Ujjal Debnath
https://arxiv.org/abs/2506.15240 ht…

The New Black Hole Solution with Anisotropic Fluid in f(R,Lm, T) Gravity: Thermodynamics
In this work, we derive a new class of analytic black hole solutions within the framework of f(R,Lm, T) gravity, where the black hole is surrounded by an anisotropic fluid acting as the matter source. We consider both linear and nonlinear forms of the function f(R,Lm, T), enabling a detailed exploration of how anisotropic pressures and different f(R,Lm, T) influence the spacetime structure. Furthermore, we derive the conditions on the coupling parameters (\b{eta}1, \b{eta}2, \b{eta}3) under whi…

Measurement-Induced Temporal Geometry
James C. Hateley
https://arxiv.org/abs/2507.04514 https://arxiv.org/pdf/2507.04514

Measurement-Induced Temporal Geometry
We propose a unified theoretical framework, Measurement-Induced Temporal Geometry (MTG), in which time, causality, and spacetime geometry emerge from quantum measurement acting on a fiber-valued internal time field. Each spacetime point supports a local degree of freedom $τ$, modeled as a smooth section of a fiber bundle $π: E \to M$, with projection events $μ[τ]$ generating classical temporal flow. Quantum coherence and entanglement are encoded in the curvature $F = \nabla^2$ of a connecti…

Dynamical Horizon Segments and Spacetime Isometries
Abhay Ashtekar, Badri Krishnan
https://arxiv.org/abs/2506.10190 https://arxiv.org…

Dynamical Horizon Segments and Spacetime Isometries
Given a space-time $(\mathscr{M}, g_{ab})$ admitting a dynamical horizon segment (DHS) $\mathscr{H}$, we show that there are stringent constraints on the Killing fields $ξ^a$ that $g_{ab}$ can admit in a neighborhood of $\mathscr{H}$: Generically, $ξ^a$ can only be a rotational Killing field which, furthermore, leaves each marginally trapped 2-sphere cross-section $\mathcal{S}$ of $\mathscr{H}$ invariant. Finally, if $ξ^a$ happens to be hypersurface orthogonal near $\mathscr{H}$, then, not o…

A viable wormhole model in a five-dimensional spacetime
Peter K. F. Kuhfittig
https://arxiv.org/abs/2506.09111 https://arxiv.org/pdf/…

A viable wormhole model in a five-dimensional spacetime
This paper generalizes two of the author's earlier wormhole solutions that are characterized by an extra spatial dimension. This paper adds the assumption that the components of the line element are functions not only of the radial coordinate $r$ but of the extra coordinate $l$ as well, resulting in a significant generalization. It is shown that the throat of the wormhole can be threaded with ordinary matter and that the unavoidable violation of the null energy condition can be attributed to th…

Kappa Plane Wave Modes and Continuous Squeezing in Quantum Field Theory
Arash Azizi
https://arxiv.org/abs/2507.08066 https://arxiv.or…

Kappa Plane Wave Modes and Continuous Squeezing in Quantum Field Theory
We introduce a new family of field modes in flat spacetime -- termed $κ$-plane wave modes -- constructed from $κ$-dependent linear combinations of Minkowski plane waves. These modes define a one-parameter family of vacua, $|0_κ\rangle$, that smoothly interpolate between different quantizations, reducing to the Minkowski vacuum in the limit $κ\to 0$. We show that $|0_κ\rangle$ is uniquely characterized as a continuous-mode squeezed vacuum, with frequency-dependent squeezing parame…

Non-oscillatory gravitational quasinormal modes of Reissner-Nordstr\"om-de Sitter spacetime
Z. Stuchl\'ik, A. Zhidenko
https://arxiv.org/abs/2506.09829

Non-oscillatory gravitational quasinormal modes of Reissner-Nordström-de Sitter spacetime
Proper oscillation frequencies of black holes (quasinormal modes) of asymptotically de Sitter black holes were extensively studied, yet the non-oscillatory (purely imaginary) branch of modes of gravitational perturbations of the four-dimensional Reissner-Nordström-de Sitter solution was omitted in the literature. This branch of modes appears as deformations of the modes of empty de Sitter space. Here we find accurate numerical values of this branch of quasinormal modes and show that they are r…

Precision predictions of Starobinsky inflation with self-consistent Weyl-squared corrections
Eugenio Bianchi, Mauricio Gamonal
https://arxiv.org/abs/2506.10081

Precision predictions of Starobinsky inflation with self-consistent Weyl-squared corrections
Starobinsky's $R+αR^2$ inflation provides a compelling one-parameter inflationary model that is supported by current cosmological observations. However, at the same order in spacetime derivatives as the $R^2$ term, an effective theory of spacetime geometry must also include the Weyl-squared curvature invariant $W^2$. In this paper, we study the inflationary predictions of the gravitational theory with action of the form $R+αR^2 - βW^2$, where the coupling constant $α$ sets the scale of infl…

DSR-relativistic spacetime picture and the phenomenology of Planck-scale-modified time dilation
Giovanni Amelino-Camelia, Giulia Gubitosi, Pietro Pellecchia, Marco Refuto, Giacomo Rosati
https://arxiv.org/abs/2506.08111

DSR-relativistic spacetime picture and the phenomenology of Planck-scale-modified time dilation
The most active area of research in quantum-gravity phenomenology investigates the possibility of Planck-scale-modified dispersion relations, focusing mainly on two alternative scenarios: the "LIV" scenario, characterized by a specific mechanism of breakdown of relativistic symmetries, and the "DSR" scenario, which preserves overall relativistic invariance but with deformed laws of relativistic transformation. Two recent studies of modified dispersion relations, one relying on Finsler geometry …

Leading-order gravitational time delay of massive particles by a moving Schwarzschild lens
Guansheng He, Wenbin Lin, Yi Xie
https://arxiv.org/abs/2506.14184

Leading-order gravitational time delay of massive particles by a moving Schwarzschild lens
The leading-order gravitational time delay of relativistic neutral massive particles (e.g., neutrinos or high-energy cosmic-ray particles) caused by a moving Schwarzschild black hole with a constant radial velocity is investigated for the first time. On the basis of the equations of motion in the spacetime of the moving lens, we achieve a new unified formula for the travel times of relativistic massive and massless particles propagating from the source to the observer within the first post-Mink…

The AdS Perspective on the Nonlinear Tails in Black Hole Ringdown
Alex Kehagias, Antonio Riotto
https://arxiv.org/abs/2506.14475 https://

The AdS Perspective on the Nonlinear Tails in Black Hole Ringdown
Black holes gradually settle into their static configuration by emitting gravitational waves, whose amplitude diminish over time according to a power-law decay at fixed spatial locations. We show that the nonlinear tails in the presence of a quadratic source, which have been recently found to potentially dominate over the linear ones, can be simply derived from the AdS$_2$$\times$S$^2$ spacetime perspective with their amplitudes being related to the Aretakis constants.

Perturbations of Einstein-Maxwell-phantom spacetime: Instabilities of charged Ellis wormholes and quasinormal modes of black holes
Guan-Yu Wu, Si-Yu Wang, Yan-Gang Miao
https://arxiv.org/abs/2507.02258

Perturbations of Einstein-Maxwell-phantom spacetime: Instabilities of charged Ellis wormholes and quasinormal modes of black holes
Phantom scalar fields, as a viable candidate for dark energy, have been instrumental in eliminating spacetime singularities and constructing wormholes and regular black holes. We investigate the Einstein-Maxwell-phantom (EMP) framework, in which the Ellis wormholes can be charged and regular black holes can be admitted. While the previous study has shown the stability of EMP wormholes under massless scalar field perturbations, we further perform a comprehensive linear analysis of the EMP spacet…

Quantum light and radiation in Rindler spacetime: from uncertainty relations to the cosmological implications
Fujin Wang, Syed Masood, L. G. Wang
https://arxiv.org/abs/2506.02417 …

Quantum light and radiation in Rindler spacetime: from uncertainty relations to the cosmological implications
Based on an analogy between diffraction integral formalism of classical field propagation and Feynman path integral approach to quantum field theory, we develop a quantum model for light and radiation in Rindler spacetime. The framework helps to reveal acceleration-induced contributions to the traditional Heisenberg position-momentum uncertainty relation. A modified Planck energy density distribution of radiation is established and reveals equivalence between temperature and Rindler acceleratio…

A discussion on the symmetry of relativistic Vlasov gas and its accretion in Kerr-Newman black hole
Yong-qiang Liu
https://arxiv.org/abs/2506.08341 https:/…

A discussion on the symmetry of relativistic Vlasov gas and its accretion in Kerr-Newman black hole
We investigate the kinetic properties of collisionless Vlasov gas in Kerr-Newman spacetime, focusing on how spacetime symmetries constrain the distribution functions. By establishing the general relationship between distribution functions and constants of motion (mass $m$, energy $E$, angular momentum $L_z$, Carter constant $L$) along with $L$'s conjugate configuration variable $Q^{3}$, we derive the analytical framework for particle dynamics in stationary axisymmetric spacetimes. Within the Lo…

Optical images of massive boson stars with nonlinear electrodynamics
Xiao-Xiong Zeng, Huan Ye, Ke-Jian He, Hao Yu
https://arxiv.org/abs/2507.11583 https://…

Optical images of massive boson stars with nonlinear electrodynamics
This study investigates the optical imaging characteristics of massive boson stars based on a model with Einstein's nonlinear electrodynamics. Under asymptotically flat boundary conditions, the field equations are solved numerically to obtain the spacetime metric of the massive boson stars. Employing the ray-tracing method, we analyze the optical images of the massive boson stars under two illumination conditions: a celestial light source and a thin accretion disk. The research reveals that the…

Universality on thermodynamic relation with corrections in Einstein-Bel-Robinson gravity Black hole
Hai-Long Zhen, Huai-Fan Li, Yu-Bo Ma
https://arxiv.org/abs/2506.08466

Universality on thermodynamic relation with corrections in Einstein-Bel-Robinson gravity Black hole
The generalized thermodynamic extremum relation, as proposed by Goon and Penco, establishes a novel theoretical framework for the study of spacetime thermodynamics. However, extant investigations generally assume that the black hole state parameter is solely a first-order function of the perturbation parameter when exploring the Goon-Penco relation in diverse spacetime contexts. An analytic expression for the perturbation parameter as a function of the black hole entropy can be expressed by tre…

Thermal Fisher information for a rotating BTZ black hole
Everett A. Patterson, Robert B. Mann
https://arxiv.org/abs/2506.12656 https://

Thermal Fisher information for a rotating BTZ black hole
Relativistic quantum metrology provides a framework within which we can quantify the quality of measurement and estimation procedures while accounting for both quantum and relativistic effects. The chief measure for describing such procedures is the Fisher information, which quantifies how sensitive a given estimation is to a variance of some underlying parameter. Recently, the Fisher information has been used to quantify the spacetime information accessible to two-level quantum particle detect…

Cosmological effect of coherent oscillation of ultralight scalar fields in a multicomponent universe
Priyanka Saha, Dipanjan Dey, Kaushik Bhattacharya
https://arxiv.org/abs/2506.12863

Cosmological effect of coherent oscillation of ultralight scalar fields in a multicomponent universe
The idea that coherent oscillations of a scalar field, oscillating over a time period that is much shorter than the cosmological timescale, can exhibit cold dark matter (CDM) like behavior was previously established. In our work we first show that this equivalence between the oscillating scalar field model and the CDM sector is exact only in a flat Friedmann-Lemaitre-Robertson-Walker (FLRW) spacetime in the absence of cosmological constant and any other possible matter components in the univers…

Helically twisted spacetime: study of geometric and wave optics, and physical analysis
Edilberto O. Silva, Frankbelson dos S. Azevedo, Faizuddin Ahmed
https://arxiv.org/abs/2506.23291

Helically twisted spacetime: study of geometric and wave optics, and physical analysis
We analyse a stationary, cylindrically symmetric spacetime endowed with an intrinsic helical twist, $ds^{2} = -dt^{2} + dr^{2} + r^{2} dϕ^{2} + (dz + ω\, r\,dϕ)^{2}$. Solving the Einstein equations exactly yields an anisotropic energy-momentum tensor whose density is negative and decays as $r^{-2}$, thus violating the weak energy condition near the axis. Three notable features emerge: (i) axis-centred negative energy; (ii) unequal transverse stresses; (iii) a torsional momentum flux $T_{ϕz}…

Canonical Electrodynamics in Ashtekar-Barbero variables
Federica Fragomeno, Saeed Rastgoo
https://arxiv.org/abs/2507.06276 https://ar…

Canonical Electrodynamics in Ashtekar-Barbero variables
We present the full Hamiltonian analysis of electrodynamics, including fermions, photons, and their interaction, on a general curved spacetime in Ashtekar-Barbero variables. No gauge fixing is performed and the theory is background independent. The details of the constraints of the theory for both Weyl and Dirac fermions are presented. Moreover, the equations of motion are derived and it is shown that they reduce to the equations of motion of the standard QFT in curved or flat spacetime in the …

Geodesics, Scalar Fields, and GUP-Corrected Thermodynamics of Charged BTZ-like Black Holes in Bopp-Podolsky Electrodynamics
Faizuddin Ahmed, Ahmad Al-Badawi, Abdelmalek Bouzenada, Erdem Sucu, \.Izzet Sakall{\i}
https://arxiv.org/abs/2507.10874

Geodesics, Scalar Fields, and GUP-Corrected Thermodynamics of Charged BTZ-like Black Holes in Bopp-Podolsky Electrodynamics
In Ref. [1], the spacetime geometry generated by compact objects in $(2+1)$-dimensional Bopp-Podolsky electrodynamics is derived. Using a perturbative approach, the authors derived a charged BTZ-like black hole solution and computed corrections up to second order in a perturbative expansion valid far from the horizon. In this work, we investigate the same circularly symmetric three-dimensional charged BH solution pierced by disclinations. We begin by analyzing the motion of photons within this …

Thermal scalar field stress tensor on a two dimensional black hole and its near horizon properties
Saurav Samanta, Bibhas Ranjan Majhi
https://arxiv.org/abs/2507.11174

Thermal scalar field stress tensor on a two dimensional black hole and its near horizon properties
We calculate the thermal renormalized energy-momentum tensor components of a massless scalar field, leading to trace anomaly, on a $(1+1)$ dimensional static black hole spacetime. Using these, the energy density and flux, seen by both static and freely-falling observers, are evaluated. Interestingly for both these observers the aforementioned quantities in Unruh and Boulware vacua are finite at the horizon when the scalar field is in thermal equilibrium with the horizon temperature (given by th…

The metric from energy-momentum non-conservation: Generalizing Noether and completing spectral geometry
Achim Kempf
https://arxiv.org/abs/2506.11186 https:…

The metric from energy-momentum non-conservation: Generalizing Noether and completing spectral geometry
We complete the program of spectral geometry, in the sense that we show that a manifold's shape, i.e., its metric, can be reconstructed from its resonant sound when tapped lightly, i.e., from its spectrum, -- if in addition we also record the resonances' mutual excitation pattern when the driving is strong enough to reach the nonlinear regime. Applied to spacetime, this finding yields a generalization of Noether's theorem: the specific pattern of energy-momentum non-conservation on a generic cu…

Scattering angle in a Topological Star spacetime: a self-force approach
Massimo Bianchi, Donato Bini, Giorgio Di Russo
https://arxiv.org/abs/2506.04876 htt…

Scattering angle in a Topological Star spacetime: a self-force approach
We compute the scattering angle for a scalar neutral probe undergoing unbound motion around a Topological Star, including self-force effects. Moreover we identify the `electro-magnetic' source of the background as Papapetrou Field compatible with the isometries and characterize Topological Stars by studying their sectional curvature, geometric transport along special curves and the gravitational energy content in terms of the super-energy tensors.