Curvature and Isocurvature Perturbations in multi-field Gauss-Bonnet inflationWe study cosmological perturbations in multi-field inflation in which the scalar fields couple to the Gauss-Bonnet terms through a general coupling function f(ϕa). We derive the complete quadratic…Seoktae Koh·Aug 24, 2026SaveLearn
Geometric formulation for the relativistic kinetic theory of photonsWe provide a geometric foundation for the kinetic theory of photons. Although the induced metric h on the light cone bundle Γ0+ is degenerate, which causes the corresponding volume element…Yifan Cai, Long Cui, Bin Wu et al.·Aug 24, 2026SaveLearn
Joule Thomson expansion of κ-deformed Schwarzschild-AdS black holeWe investigate the Joule-Thomson expansion of a non-commutative Schwarzschild-AdS black hole, whose space-time geometry is described by the Lie-algebraic κ-deformed space-time, and show that the…Vishnu Rajagopal, Puxun Wu·Aug 24, 2026SaveLearn
Resonance crossings as entire functions of the Koopman operatorAstrophysical binaries formed by a stellar-mass compact object and a massive black hole are among the most promising sources for future space-based gravitational-wave detectors. These extreme…Priscilla Canizares·Aug 24, 2026SaveLearn
Curvature-driven spin transport in rank-two string-Carroll hydrodynamicsWe derive the rank-two string-Carroll limit of the canonical stress--spin Ward system for probe matter on a fixed torsion-free background. Beyond rank-one Carroll spin hydrodynamics, this retains the…Nikko John Leo Lobos, Reggie Pantig·Aug 23, 2026SaveLearn
Comment on Stellar structure and stability of charged interacting quark stars and their scaling behaviorWe comment on an error in the charged quark star literature ( Phys. Rev. D, 102(3):034031, 2020 ) that resulted in erroneous solutions to the radial stability equations for charged interacting quark…Yann Bissessur, Michael Gammon, Robert B. Mann·Aug 23, 2026SaveLearn
Killing tensors of Weyl's classThis work represents an initial step towards a systematic framework for identifying hidden symmetries in algebraically general (Petrov type I) spacetimes. Motivated by this, we focus on Weyl's…Dionysios Kokkinos·Aug 23, 2026SaveLearn
Cosmological extra dimensions can mimic dark matter I. Dark matter in galaxiesWe present a simple model with a n + 4-dimensional metric with compactified extra dimensions with a space dependent radius R. We show that changes in the profile of R are sourced by (visible) matter…Mattia Villani·Aug 23, 2026SaveLearn
Correlated and coincident noise in Einstein Telescope's triangular configurationThe Einstein Telescope (ET) is a proposed underground infrastructure in Europe to host future generations of gravitational-wave (GW) detectors. Two configurations are under investigation. The first…Jan Harms·Aug 23, 2026SaveLearn
Thermodynamics of Genuine Kerr-Bertotti-Robinson Black HolesWe propose a thermodynamic description of the genuine Kerr-Bertotti-Robinson (Kerr-BR) black hole spacetimes. Contrary to previous studies, such solutions no longer have electric charge.…David Kubiznak, Hryhorii Ovcharenko, Jiri Podolsky·Aug 23, 2026SaveLearn
Extreme mass-ratio inspirals around rotating accelerating black holesExtreme mass-ratio inspirals (EMRIs) can magnify small departures from Kerr dynamics into appreciable gravitational-wave phase shifts accumulated over many orbital cycles. We exploit this sensitivity…Xin-Dong Du, Tao Zhou, Wei Xiong et al.·Aug 23, 2026SaveLearn
An exact dyonic black hole at the integrable locus of quadratic nonlinear electrodynamicsWe obtain an exact dyonic black-hole solution in quadratic nonlinear electrodynamics defined by -F+aF2+bG2 on the special locus b=a/2. At this locus, the radial dependence in the electric…Faizuddin Ahmed, Ahmad Al-Badawi, Izzet Sakalli·Aug 22, 2026SaveLearn
Learning Boson Star Solution Families with Physics-Informed Neural NetworksComputing boson star families traditionally requires repeated solution of nonlinear eigenvalue boundary-value problems and careful numerical continuation through turning points. We develop a…Ao Liu, Chen-Hao Hao, Cuihong Wen et al.·Aug 22, 2026SaveLearn
Discrete self-similarity imprints on primordial-black-hole mass functionsWe study how discrete self-similarity (DSS) in the critical behavior of scalar-field collapse is imprinted on primordial-black-hole (PBH) mass functions. Using the DSS-modulated critical scaling law…Luis E. Padilla, Tomohiro Harada, Hayami Iizuka·Aug 22, 2026SaveLearn
The Schwarzschild Black Hole in an External Gravitational Tidal Field: the Quasinormal SpectrumA black hole need not ring down in isolation, since a nearby companion can subject it to an external gravitational tide. We calculate how a quadrupole tide modifies the Schwarzschild black hole…Dimitrios Giataganas, Alex Kehagias, Antonio Riotto·Aug 22, 2026SaveLearn
Probing Variations of Newton's Constant in Strong Gravitational FieldsThe constancy of Newton's gravitational constant G is a fundamental prediction underlying general relativity and a critical assumption in theories of gravity beyond it. We report a high-precision…T. D. Le·Aug 22, 2026SaveLearn
Quantum speed limit time of a uniformly accelerated Unruh-DeWitt detectorWithin the open quantum system formalism, using the Markovian process, we investigate the quantum speed limit time (QSLT) of a uniformly accelerated Unruh-DeWitt detector, interacting with the…Debasish Ghosh, Bibhas Ranjan Majhi·Aug 21, 2026SaveLearn
Kerr-Newman and genuine Kerr black holes in the Bertotti-Robinson magnetic fieldWe present a spacetime that describes a rotating and charged black hole immersed in an external magnetic field. This exact solution to the Einstein-Maxwell equations has a surprisingly simple form…Hryhorii Ovcharenko, Jiri Podolsky·Aug 21, 2026SaveLearn
Beyond de Sitter: Longitudinal-Mode Instabilities and Spectral Evolution of Massive Vector Fields with Non-Minimal Curvature Coupling during InflationWe investigate the inflationary dynamics of a spectator massive vector field with a non-minimal curvature coupling in de Sitter (dS) and quasi-de Sitter (qdS) backgrounds, focusing on the transverse…Ehsan Momeni, Fatimah Shojai·Aug 21, 2026SaveLearn
Dual entropy gain by radiation at the zero temperature limitRecently we have demonstrated that black hole radiation can be smoothly extended to the zero-temperature limit. Here we analyse entropy variations at the zero temperature limit and evaluate the…Koray Düztaş·Aug 21, 2026SaveLearn
Black hole singularity is a surface not a pointIt is widely repeated in the popular literature and elsewhere that the singularity at the center of a black hole is a point. It is not true. Two observers who free-fall into a spherical black hole…Andrew J. S. Hamilton, Tyler McMaken·Aug 21, 2026SaveLearn
Study of Dynamical Instability of Collapsing Charged Spherically Symmetric Anisotropic Matter Configurations within Non-Minimally Coupled GravityWe investigate the dynamical instability and gravitational collapse of charged, spherically symmetric anisotropic matter configurations within f(R,Lm) gravity. The analysis focuses on…A. Rehman, M. Yousaf, Mohammed Zakarya et al.·Aug 21, 2026SaveLearn
Electrically Charged Non-Abelian Black String in Anti-de Sitter SpaceWe construct a new family of static, electrically charged, cylindrically symmetric black-string solutions of four-dimensional Einstein--Yang--Mills theory with a negative cosmological constant,…G. Alencar, R. N. Costa Filho, I. Jardim et al.·Aug 21, 2026SaveLearn
Chiral symmetry and black hole isospectralityWe prove that black-hole isospectrality between linearly independent solutions follows whenever radiative metric and matter perturbations are reconstructed from complex master variables obeying a…Colin Weller, Dongjun Li, Pratik Wagle et al.·Aug 21, 2026SaveLearn
Static electric and magnetic traversable wormholes in (2+1)-dimensional nonlinear electrodynamicsEvery traversable wormhole reported so far in static (2+1) gravity coupled to nonlinear electrodynamics has come from a power-Maxwell Lagrangian L propto |F|k restricted to k=1/2, always forcing the…Mauricio Cataldo·Aug 21, 2026SaveLearn