Quadrupolar tidal effects destroy the integrability of black hole geodesics: analytic proof and numerical evidence of chaosIn general relativity, the motion of a test mass around a rotating black hole is described by Kerr geodesics. Owing to the symmetries of the Kerr spacetime, these geodesics possess four constants of…Paul Ramond·Jul 29, 2026SaveLearn
Discrete symmetries of modified Teukolsky equationsThe Teukolsky equation possesses discrete symmetries that constrain the properties of black hole perturbations and their quasinormal mode spectrum. In this study, we explore how a class of…Ciro De Simone·Jul 29, 2026SaveLearn
Resumming Kerr Quasinormal-Mode Frequencies: Accuracy and Breakdown Near ExtremalityKerr black-hole quasinormal modes are usually computed with numerical methods, but analytic approximations remain useful for identifying the physics that controls different parts of the spectrum. In…Jierui Hu, Kent Yagi, Nicolas Yunes·Jul 29, 2026SaveLearn
On a cosmological Oppenheimer-Snyder model: matching McVittie and FLRW spacetimesWe consider the necessary and sufficient conditions for the smooth matching of an expanding McVittie spacetime and a spatially flat Friedmann-Lema\ıtre-Robertson-Walker (FLRW) spacetime across a…Brien C. Nolan·Jul 29, 2026SaveLearn
Junction Conditions, Radial Stability, Thermodynamics, Optical Geometry and Appearance of Polymer-Quintessence Thin-Shell WormholesThin-shell wormholes built from effective black hole geometries are sensitive not only to the lapse function but also to the choice of areal radius. We construct a reflection-symmetric thin-shell…Jonathan A. Rebouças, Edson Otoniel, M. C. Araújo et al.·Jul 29, 2026SaveLearn
Advanced Virgo during the LIGO-Virgo-KAGRA fourth observing runFrom April 10, 2024 to November 18, 2025 Advanced Virgo participated in the fourth observing run of the network of gravitational-wave detectors, together with Advanced LIGO and KAGRA. For this…Virgo Collaboration, F Acernese, A Agapito et al.·Jul 29, 2026SaveLearn
Bouncing Cosmology and Cosmological Dynamics in f(Q,T) GravityWe propose a reconstructed cosmological model in the framework of f(Q,T) gravity, that provides a unified description of the early- and late-time evolution of the Universe. The model exhibits a…Bhagwat Gidhad, A. S. Agrawal, S. A. Kadam·Jul 29, 2026SaveLearn
Generation and purification of excited spacetimes using Schwarzian derivativeIn this article, we use the expression of the Schwarzian derivative to set up differential equations to find answers to three fundamental questions in the context of QFT in curved spacetime,…Rakesh K Jha, Akhil U Nair, Prasant Samantray et al.·Jul 29, 2026SaveLearn
A Bound on the Dynamical Love NumberThe tidal deformability of a compact object is encoded in a single function of frequency, the retarded Green's function relating the induced multipole to the applied tide. Causality, reality,…Alex Kehagias, Antonio Riotto·Jul 29, 2026SaveLearn
Bayesian nonparametric estimation of correlated gravitational wave detector network noise using matrix-gamma process priorsThis paper addresses the important problem of estimating the noise spectral density of next-generation gravitational-wave detectors, such as LISA and the Einstein Telescope (ET), where cross-channel…Yixuan Liu, Renate Meyer, Nelson Christensen et al.·Jul 29, 2026SaveLearn
Gravitational bremsstrahlung waveform at the eighth post-Minkowskian order in the extreme-mass-ratio limitThe gravitational waveform generated by the scattering of two nonspinning bodies is computed in the frequency domain in the extreme-mass-ratio limit at the eighth post-Minkowskian (PM) order (i.e.,…Andrea Geralico·Jul 29, 2026SaveLearn
Constraining deviations from the Teukolsky equation with GW250114The recent gravitational-wave detection GW250114 by the LIGO-Virgo-KAGRA (LVK) Collaboration provides unprecedented precision for testing general relativity (GR) through black hole ringdowns. In this…Sebastian H. Völkel, Nicola Franchini·Jul 29, 2026SaveLearn
Chaotic Imprints in Gravitational Waves from Conformal-Anomaly-Corrected Extreme-Mass-Ratio InspiralsIn this work, we investigate the effect of chaotic orbits on the extreme mass ratio inspiral (EMRI) gravitational wave signals where the central black hole is corrected by quantum conformal anomaly.…Wei-Hao Zhang, Yu-Sen An·Jul 29, 2026SaveLearn
Exact solutions for static spherically symmetric spacetime with a perfect fluid in Rastall theoryIn general relativity, exact Liouvillian solutions for a static and spherically symmetric spacetime with a perfect fluid and the equation of state p(r)=wρ(r) are known only for $w=0,-16,…Yoshimune Tomikawa, Ichika Obara, Takumi Orimo·Jul 29, 2026SaveLearn
Charged Dirac starsIn this work we solve the coupled Einstein-Dirac-Maxwell (EDM) system for static spherically symmetric configurations of two fermions in a singlet spinor state within the 3+1 formalism of general…Maribel Hernández Márquez, Miguel Alcubierre·Jul 29, 2026SaveLearn
Dendro-GR at high mass ratios with high spinsThe Laser Interferometer Space Antenna (LISA) launches in less than a decade; it will detect spinning high-mass-ratio binary black hole inspirals annually, alongside other third-generation…William K. Black, David W. Neilsen, Eric W. Hirschmann et al.·Jul 29, 2026SaveLearn
Parameter Estimation on LIGO-Virgo-KAGRA O4a Binary Merger Triggers with Sub-solar Mass ComponentsThe LIGO-Virgo-KAGRA collaboration has reported the results for searches for sub-solar mass components in compact binary coalescence during observing run O4a. No detection candidates were identified,…Nelson Christensen, Neil Cornish, Florian Kühnel et al.·Jul 29, 2026SaveLearn
Static Black Holes and Iyer-Wald Entropy in f(R,K) GravityWe investigate static, spherically symmetric black hole solutions in a class of higher-curvature gravitational theories described by a Lagrangian that depends on the Ricci and Kretschmann scalars.…I. Díaz-Saldaña, J. López-Domínguez, Wilfredo Yupanqui et al.·Jul 29, 2026SaveLearn
Extreme mass-ratio inspirals into Newtonian Proca starsMassive bosonic fields can form self-gravitating solitonic structures, which for vector fields are known as Proca stars. For ultralight fields, these structures can describe the cores of dark matter…João Bernardo Silva, Richard Brito·Jul 29, 2026SaveLearn
The Quantum Boundary of Black Hole Interiors: Signature Failure and the Termination of Mass InflationClassical general relativity predicts a singularity at the center of every black hole. We argue that it is never reached. We adopt the conjecture of Shaya (2026) that a metric element of…Edward J. Shaya·Jul 29, 2026SaveLearn
The first decade of gravitational-wave measurements of black hole spinsA decade after the first direct detection of gravitational waves, the growing catalog of hundreds of confirmed events is revealing new insights into the spins of stellar-mass black holes. Spin…Sylvia Biscoveanu·Jul 29, 2026SaveLearn
Superdilations at Schwarzschild null infinityRelying on the definition of asymptotic conformal Killing horizons, the generators of asymptotic conformal symmetries at future null infinity in Schwarzschild space-time are considered. The algebra…Marco Refuto·Jul 29, 2026SaveLearn
Extending the model of rotating acoustic geometries to include nonvanishing solid-body rotation: Quasibound spectraIn a very recent paper, we computed the quasibound states of massless acoustic excitations interacting with a new (effective) acoustic geometry with circulation. Notably, the behavior of this…H. S. Vieira·Jul 29, 2026SaveLearn
Absorption and quasinormal modes by rotating acoustic black holes in Lorentz-violating backgroundIn this work, we investigate the effects of Lorentz symmetry violation on the absorption cross section and quasinormal modes of a rotating acoustic black hole in (2+1) dimensions, within the regime…J. A. V. Campos, M. A. Anacleto, F. A. Brito et al.·Jul 29, 2026SaveLearn
Ringdown waves from hairy black holesWe study how quasinormal-mode frequencies may encode information about the effective matter source responsible for black-hole hair. Using the established eikonal correspondence between quasinormal…Ariadna Uxue Palomino Ylla, Kosuke Makino, Akane Tanaka et al.·Jul 29, 2026SaveLearn