Minimum lifetime of a black holeWe derive bounds on the lifetime of an evaporating black hole. The bound follows from energy conservation and purification, within the framework of `asymptotically semiclassical spacetimes'. We…Eugenio Bianchi, Matthew Brandsema, Kenneth Czuprynski et al.·May 5, 2026SaveLearn
Total transmission modes in draining bathtub model with vorticityWe investigate the total transmission modes (TTMs) in the draining bathtub model (DBM) with vorticity using the Chebyshev-Lobatto pseudospectral method, where the boundary conditions of the total…Zhe Yu, Liang-Bi Wu·May 5, 2026SaveLearn
Long-lived massive scalar modes, grey-body factors, and absorption cross sections of the Reissner--Nordström-like brane-world black holeWe study quasinormal modes, including the quasi-resonant regime, grey-body factors, and absorption cross sections of a massive scalar field in a Reissner--Nordström-like brane-world black hole…Zainab Malik·May 5, 2026SaveLearn
Novel Realizations of Warp Drive Spacetimes as Solutions of General RelativityWe first take a closer look at the original warp drive proposal by Alcubierre, examine its kinematics in the context of a covariant 3+1 setting, and explain some drawbacks of this construction. In…Thomas Buchert, Antony Frackowiak·May 5, 2026SaveLearn
Non-radial pulsations of gravitationally coupled two-fluid neutron stars in general relativityNon-radial oscillations of neutron stars provide a powerful probe of stellar structure and relativistic gravity, but a fully general relativistic treatment for gravitationally coupled two-fluid stars…Ankit Kumar, Daniel A. Caballero, Hajime Sotani et al.·May 5, 2026SaveLearn
High-Power AM-CW Lunar Laser Ranging as a μHz SGWB DetectorHigh-power amplitude-modulated continuous-wave lunar laser ranging (AM-CW LLR) is a stochastic-gravitational-wave-background (SGWB) experiment that measures GW-driven drift and diffusion of the…Slava G. Turyshev·May 4, 2026SaveLearn
Stability of Synthetic Timelike Ricci Bounds under C0-Limits and Applications to Impulsive Gravitational WavesWe investigate the stability of timelike Ricci curvature lower bounds under low-regularity limits of Lorentzian metrics. Specifically, we prove that the synthetic curvature-dimension condition…Andrea Mondino, Vanessa Ryborz, Clemens Sämann·May 4, 2026SaveLearn
Axial tidal Love numbers of black holes in matter environmentsWe study the axial (magnetic) tidal Love numbers of a Schwarzschild black hole surrounded by a spherically symmetric matter distribution. While the formalism developed here is general, we specialize…Simone D'Onofrio, Sayak Datta, Andrea Maselli·May 4, 2026SaveLearn
Black Hole Thermodynamics via Tsallis Statistical Mechanics and Phase Transitions Probed by Optical CharacteristicsWe develop a non-extensive thermodynamic framework for Reissner--Nordström black holes based on a near-horizon photon-gas model within Tsallis statistics. We derive the generalized…Phuwadon Chunaksorn, Ratchaphat Nakarachinda, Pitayuth Wongjun·May 4, 2026SaveLearn
Scattering of scalar, electromagnetic, and Dirac fields in an asymptotically flat regular black hole supported by primordial dark matterWe study grey-body factors and absorption cross sections for massless scalar, electromagnetic, and Dirac fields in the exact asymptotically flat regular black-hole geometry supported by a phantom…S. V. Bolokhov·May 4, 2026SaveLearn
Gravitational electric-magnetic duality at the light ring and quasinormal mode isospectrality in effective field theoriesBlack hole perturbations are characterized by a superposition of damped exponentials known as quasinormal modes. In general relativity, the spectra of parity-even and parity-odd quasinormal modes…Ibrahima Bah, Emanuele Berti, Valerio De Luca et al.·May 4, 2026SaveLearn
Polarized Equatorial Emission around Kerr Black Holes with Synchronized Scalar Hair. I. Direct imagesWe investigate the polarization properties of the direct images of a geometrically and optically thin accretion disk around fully self-consistent models of rotating Kerr black holes with synchronized…Valentin O. Deliyski, Galin N. Gyulchev, Daniela D. Doneva et al.·May 4, 2026SaveLearn
Orbital Nodal Phase as a Pipeline Invariant in Black Hole TimingTiming analyses of accreting black holes often package nodal information in ways that depend on benign choices of time and azimuthal convention. We identify the corresponding pipeline-invariant…Mehmet Baran Ökten·May 4, 2026SaveLearn
Gravitational-Bumblebee perturbations: Exact decoupling and isospectralityIn this paper, we present the exact decoupling of the full metric and bumblebee field perturbations in a Schwarzschild-like background. The coupled system reduces to four decoupled master equations,…Hui-Fa Liu, Wentao Liu, Yu-Xiao Liu et al.·May 4, 2026SaveLearn
Exact solutions for slowly rotating wormholes in the presence of an anisotropic fluidWe construct slowly rotating traversable wormholes in the presence of an anisotropic fluid. Starting from a Teo-type stationary, axisymmetric extension of the Morris-Thorne metric, we perform a…Davide Batic, Denys Dutykh, Mark Essa Sukaiti·May 4, 2026SaveLearn
Singularity softening and avoidance by the action of thermal radiation in a generalized entropic cosmologySome relevant aspects of a new form of generalized entropic cosmology, recently introduced by Nojiri, Odintsov and Faraoni, are considered. The setup is a logarithmic equation of state for a viscous…E. Elizalde, A. V. Yurov, A. V. Timoshkin·May 4, 2026SaveLearn
Testing General Relativity Through Gravitational Wave Classification: A Convolutional Neural Network FrameworkWe present a machine learning framework for testing general relativity (GR) with gravitational wave signals from binary black hole mergers. Using the source parameters of 173 BBH events from the GWTC…Lavinia Heisenberg, Shayan Hemmatyar, Hector Villarrubia-Rojo·May 4, 2026SaveLearn
Bondi and Novikov-Thorne accretion in regular black holes and Simpson-Visser spacetimesWe compare the Bondi spherical accretion model and the Novikov-Thorne thin disc formalism around regular black holes and Simpson-Visser spacetimes, using several equations of state for the accreting…Serena Gambino·May 4, 2026SaveLearn
Non-variational scalar field cosmology: Exact Bianchi I solutions for near-minimal scalar fieldsThe purpose of this work is to investigate spatially homogeneous and flat cosmological solutions of the Einstein equations coupled to a non-variational ``near-minimal'' scalar field. This…Joshua Ritchie·May 3, 2026SaveLearn
Ergosphere Geometry and Thermodynamic Properties of Boosted Kerr-Taub-NUT Solutions in Kaluza-Klein TheoryWe investigate rotating black holes obtained by applying a Kaluza-Klein boost to the Kerr-Taub-NUT spacetime and study the resulting four-dimensional geometry and thermodynamics after dimensional…Hasan Oguz, Goksel Daylan Esmer·May 3, 2026SaveLearn
Pole structure of the Kerr Green's functionWe investigate the pole structure of Kerr black-hole perturbations in the frequency domain, focusing on the building blocks of the Green's function for the radial Teukolsky equation: the…Hayato Motohashi, Yuto Suichi·May 3, 2026SaveLearn
Weyl Cosserat Elasticity and Gravitational Memory: An Effective Microstructured Model of SpacetimeWe construct a mathematically controlled correspondence between the electric and magnetic parts of the Weyl tensor in vacuum general relativity and the kinematics of a micropolar (Cosserat) elastic…David Izabel·May 3, 2026SaveLearn
Spinning charged test particle dynamics around a Schwarzschild black hole embedded in a homogeneous magnetic fieldWe study the dynamics of spinning charged test particles orbiting a Schwarzschild black hole immersed in a test uniform magnetic field. This setup provides a simple but physically relevant framework…Misbah Shahzadi, Martin Kolos, Ondrej Zelenka et al.·May 3, 2026SaveLearn
Gravitational baryogenesis in scalar-nonmetricity f(Q,ϕ) gravityIn this work, we investigate gravitational baryogenesis in the framework of scalar-nonmetricity theories by considering two classes of modified gravity models, namely f(Q,ϕ)=Q+ξQ ϕ2 and…F. Mavoa, M. C. Sow, M. G. Ganiou et al.·May 3, 2026SaveLearn
Reviving Motivated Inflationary Potentials with K-inflation in the light of ACTRecent ACT data favor a higher scalar spectral index ns, placing models such as α-attractor T-models and natural Inflation in tension with current observations. We propose a K-inflation…Milad Solbi, Daris Samart, Peera Simakachorn·May 3, 2026SaveLearn