Gravitational-Wave Constraints on R2 GravityGravitational waves from compact binary coalescences provide a unique opportunity to test general relativity in the strong-field regime. Quadratic f(R)=R+aR2 gravity is among the simplest…Pawan Kumar Gupta, Laura Sagunski·Nov 4, 2026SaveLearn
Axial black hole perturbations in purely-metric Horndeski theoriesWe study axial (odd-parity) perturbations about static and spherically-symmetric curvaturised black hole solutions of purely-metric Horndeski theories. We first review the construction of…Héloïse Delaporte, Hugo Roussille·Nov 4, 2026SaveLearn
Inflationary attractors in metric-affine gravityWe study single-field slow-roll inflation in metric-affine gravity (MAG). We consider the most general action up to operators linear in curvature and quadratic in the distortion, without propagating…Ilaria Andrei, Christian Dioguardi·Nov 4, 2026SaveLearn
Born-Infeld black holes in bumblebee gravityWe construct exact static and spherically symmetric charged solutions in bumblebee gravity minimally coupled to Born--Infeld electrodynamics, taking into account a spacelike vector norm and a…A. A. Araújo Filho, E. M. Siquieri, N. Heidari et al.·Nov 4, 2026SaveLearn
Quasi-equilibrium tidal folds of white dwarfs around rotating black holes in shift-symmetric Einstein--scalar--Gauss--Bonnet gravityWe examine how the geometry of rotating black holes in linear, shift-symmetric Einstein--scalar--Gauss--Bonnet (EsGB) gravity changes the limiting tidal equilibria of white dwarfs (WDs). The…Shoupan Liu, Meilin Liu, Yu Wang et al.·Nov 4, 2026SaveLearn
Dipolar boson stars as static two-body systems: an effective-one-body descriptionDipolar boson stars consist of two scalar-field lumps held in static equilibrium by the balance between gravitational attraction and scalar repulsion. The repulsion stems from a π phase difference…Thibault Damour, Romain Gervalle, Tamanna Jain·Nov 4, 2026SaveLearn
Probing black bounce spacetime through mass accretion rateWe study steady, spherically symmetric accretion of a collisionless kinetic gas onto a compact object described by the Simpson--Visser (SV) metric, a one-parameter regularization of the Schwarzschild…Xi-Rui Guo, Ya-Peng Hu, Yu-Sen An·Nov 4, 2026SaveLearn
Quasinormal modes of charged de Sitter black holes and strong cosmic censorship in conformal Killing gravityThe strong cosmic censorship conjecture argues that the future evolution of the spacetime should be predictable from the initial data. However, within the framework of general relativity, some…Gao-Ming Deng, Zong-Yao Zhang, Yiwen Liu et al.·Nov 4, 2026SaveLearn
A Geometric No-Go Theorem for Regular Black Holes in Scalar-Tensor TheoriesPerturbative instabilities generically puzzles singularity-free spacetimes, including non-singular bounce, traversible wormholes and regular black holes (RBHs). Can the scalar-tensor (ST) theories…Shulang Peng, Jun Tao, Mian Zhu et al.·Nov 4, 2026SaveLearn
Constraining Lorentz Invariance Violation via Precision Atomic SpectroscopyThis paper investigates Lorentz violation arising from quantum gravity effects in electronic and muonic hydrogen atoms. The violation is modeled through a modified dispersion relation parameterized…A. S. Lemos, J. E. J. Matias, F. Dahia et al.·Nov 4, 2026SaveLearn
Metric reconstruction in a Bondi-like gaugeMetric perturbations obtained from a Hertz potential in an ingoing radiation gauge (IRG) generically grow in an outgoing coordinate r at future null infinity, and are therefore not asymptotically…Marc Casals, Stefan Hollands, Vahid Toomani et al.·Nov 4, 2026SaveLearn
Missing solutions in scalar-Gauss-Bonnet gravityWe discover novel neutron star solutions under scalar-Gauss-Bonnet (sGB) gravity which have been missed altogether in the existing literature. The complete solution space also reveals a new…Oğuzhan K. Yamak, Kalin V. Staykov, Fethi M. Ramazanoğlu et al.·Nov 4, 2026SaveLearn
Coupled membrane response and horizon dissipation in four-dimensional Einstein-scalar-Gauss-Bonnet gravityWe develop an action-based membrane paradigm for nonextremal, static, spherically symmetric black holes in four-dimensional Einstein-scalar-Gauss-Bonnet (EsGB) gravity, describing their interaction…Yan-Heng Jin, Wen-Biao Han·Nov 4, 2026SaveLearn
Topology change and the Gauss Bonnet term in causal set theory: the sign of the cosmological term and the axion decay constantCausal set theory permits changes of spatial topology without the metric degeneracy that forbids them in continuum Lorentzian gravity. In four dimensions such changes enter the gravitational action…Stylianos A. Tsilioukas·Nov 4, 2026SaveLearn
Research on gravitational waves from extreme mass ratio inspirals in an axisymmetric Finslerian extension of Schwarzschild spacetimeWe investigate gravitational waves from extreme mass ratio inspirals in an axisymmetric Finslerian extension of the Schwarzschild spacetime. Its angular component is described by a two-dimensional…Jin-Tao Yao, Zhi-Chao Zhao, Xin Li·Nov 4, 2026SaveLearn
Spacetime Evolution Induced by a Massive Cosmic String in Numerical RelativityCosmic strings are one-dimensional topological defects formed during phase transitions in the early universe. ''Massive'' cosmic strings possess a sufficiently large tension to close…Yoshihiro Kishimoto, Cristian Joana, Teruaki Suyama·Nov 4, 2026SaveLearn
Exact teleportation bounds for fermionic Hawking thermality beyond the single-mode approximationFermionic teleportation near a Schwarzschild horizon involves two physically distinct ingredients that are often varied together: Hawking thermal mixing and the relative composition of the right and…Zhiming Huang·Nov 4, 2026SaveLearn
Bumblebee radiation from neutral matter around a black holeWe investigate bumblebee radiation generated by neutral matter orbiting a black hole with a radial spacelike vector vacuum. Starting from a point particle coupled minimally to the metric, we derive…A. A. Araújo Filho·Nov 3, 2026SaveLearn
Geodesic completeness and photon propagation in a superconducting T-duality black holeThe purpose of this article is twofold. First, we study the geodesic completeness of the string T-duality black hole with the Raychaudhuri equation, for radial massive particles of arbitrary specific…Kimet Jusufi·Nov 3, 2026SaveLearn
Black hole quasinormal mode excitation and mixing for coupled fieldsThe idea of testing the nature of black holes and possible deviations from general relativity from their oscillation spectrum, known as ``black hole spectroscopy'', has become an experimental…Caio F. B. Macedo, Orival R. de Medeiros, Emanuele Berti et al.·Nov 3, 2026SaveLearn
The quasi-topological space of quasi-topological gravitiesWe investigate general properties of quasi-topological theories of gravity involving infinite towers of polynomial densities and of their regular vacuum black hole solutions. We show that every…Pablo Bueno, Robie A. Hennigar, Matteo G. Marrone et al.·Nov 3, 2026SaveLearn
The Start Time of RingdownWe determine the convergence of quasi-normal modes sums for a point-particle plunging into a Schwarzschild black hole. While a dynamical amplitude model reproduces the waveform after the particle…Adrien Kuntz·Nov 3, 2026SaveLearn
Kerr metric perturbations in Lorenz gauge via numerical relativity methodsGravitational self-force calculations are needed to accurately describe the motion of a small body in a spinning (Kerr) black hole spacetime, which is vital to predict gravitational wave signals from…Nami Nishimura, Nils L. Vu, Adrià Gispert-Fernández et al.·Nov 3, 2026SaveLearn
Dirac stars in Einstein-Euler-Heisenberg theoryWe study self-gravitating configurations of a charged classical spinor field coupled to gravity and to Euler-Heisenberg (EH) nonlinear electrodynamics, truncated at quartic order. The spinor is…Salvatore Capozziello, Allah Ditta, M. Yousaf et al.·Nov 3, 2026SaveLearn
Full-Stokes response to a stochastic gravitational-wave background in pulsar timing arrays: Fully analytic overlap reduction functions at finite distance and coherence of close pulsar pairsWe derive fully analytic overlap reduction functions for the full-Stokes response of a pulsar timing array to an anisotropic tensor gravitational-wave background in general relativity. The response…Kun Zhou, Jin Li·Nov 3, 2026SaveLearn