Updated Upper Limits on the Isotropic Gravitational-Wave Background from LIGO, Virgo, and KAGRA Data through April 2025We report results from a search for an isotropic stochastic gravitational-wave background using data collected by the LIGO--Virgo--KAGRA Collaboration. The analysis uses data from the first observing…The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration et al.·Aug 24, 2026SaveLearn
Action-selected currents and a singular conservation closure in two-fluid energy--momentum-squared cosmologyIn multi-fluid, matter-type gravity, the Bianchi identity constrains the divergence of the total effective stress tensor but does not, by itself, determine the currents assigned to its constituent…Özgür Akarsu, Bilal Bulduk, Nihan Katırcı·Aug 24, 2026SaveLearn
Scalar charge bounds for extremal black hole formationI prove that a collapsing charged scalar field with scalar charge e that forms an exactly extremal Reissner--Nordström black hole à la Kehle--Unger with radius r+ must satisfy…Berend Schneider·Aug 24, 2026SaveLearn
Kerr Black Hole UniquenessWe prove the black hole uniqueness conjecture in the axially symmetric, stationary vacuum setting: there is no regular, asymptotically flat equilibrium configuration with more than one horizon…Qing Han, Marcus Khuri, Gilbert Weinstein et al.·Aug 24, 2026SaveLearn
Gravitational lensing outside and inside of a marginally unstable photon sphere at a Z2-symmetric wormhole throat in strong deflection limitsThe deflection angles of rays diverge logarithmically near outside and inside of a photon sphere and they could be detected by near-future space observations on black hole shadows. We show that the…Naoki Tsukamoto·Aug 24, 2026SaveLearn
Complex frequency evolution of direct waves from binary black hole mergersWhile no signal originating at a black hole's event horizon can reach future null infinity, information about the horizon and its immediate vicinity can be encoded in asymptotic properties of…Ling Sun, Sizheng Ma, Patrick P. Chen et al.·Aug 24, 2026SaveLearn
Relational Quantum Causal Processes toward Quantum Gravity with Controlled Einstein ResponseWe construct a finite-Hilbert interacting quantum model in which matter and geometric response are generated by a single Schwinger functional along one spatial refinement. Two inequivalent…Yipeng Xu·Aug 24, 2026SaveLearn
Remarks on quantum scalar field theory for a uniformly accelerated reference frame and a Schwarzschild black holeIn the present paper, the cases of a uniformly accelerated reference frame and a Schwarzschild black hole in two and four dimensions are discussed focusing on formal aspects of the corresponding…Mikhail N. Smolyakov·Aug 24, 2026SaveLearn
Gravitationally-decoupled hairy black holes: probing geometric, optical, and quasinormal mode signaturesGravitational-decoupling provides a systematic framework for constructing black hole geometries from known (seed) solutions (such as the Schwarzschild), whose exterior properties closely resemble…Paul Allen M. Gonzales, Anna Chrysostomou, Alan S. Cornell et al.·Aug 24, 2026SaveLearn
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