Formation of trapped surfaces for the spherically symmetric Einstein-Yang-Mills system with non-trivial incoming dataWe establish a trapped surface formation theorem for the spherically symmetric Einstein Yang Mills equations in a double-null gauge. The theorem concerns characteristic initial data posed on a pair…Nikolaos Athanasiou, Puskar Mondal, Shing-Tung Yau·Aug 10, 2026SaveLearn
Low-energy limit in the anomaly-induced action and the semiclassical cosmological bounceIn the recently proposed scenario, the cosmological bounce occurs because the initially contracting Universe is not empty. In the region close to singularity, matter contents of the Universe heat up…Wagno Cesar e Silva, Nicolas R. Bertini, Ilya L. Shapiro·Aug 10, 2026SaveLearn
Dynamical Barbero--Immirzi field coupled to quintessence: gravitational-wave propagation constraints and next-generation forecastsWe investigate the imprints of a dynamical Barbero--Immirzi (BI) field γ(x) coupled to a quintessence scalar field ϕ on gravitational-wave (GW) propagation. In the framework of…Zhi-Fu Gao, Hui Wang, Luiz Carlos Garcia de Andrade et al.·Aug 10, 2026SaveLearn
Observational constraints on fractional holographic dark energy in the light of DESI DR2Based on the fractional entropy from fractional quantum mechanics, fractional holographic dark energy (FHDE) has been proposed with the Hubble horizon as the IR cutoff (FHDEH). We extend this…Qihong Huang, Yuchen Zhang, Bing Xu et al.·Aug 10, 2026SaveLearn
Geodesic structure, eikonal quasinormal modes and thermodynamic properties of a Schwarzschild-de Sitter-like black hole with global monopole in Bumblebee gravityWe investigate the geodesic dynamics, eikonal quasinormal modes (QNMs), and extended phase space thermodynamics of a Schwarzschild-de Sitter-like black hole coupled with a global monopole in…Irengbam Roshila Devi, Yenshembam Priyobarta Singh, Dhruba Jyoti Gogoi et al.·Aug 10, 2026SaveLearn
Massive neutral Dirac quasibound states in a Newman-Janis-generated rotating charged Kalb-Ramond black-hole geometryWe study quasibound states of a massive neutral Dirac field in the Newman-Janis-generated rotating charged geometry used in Lorentz-violating Kalb-Ramond (KR) gravity. Rather than assuming that the…Sardor Murodov, Olimjon Kholturayev, Bahodir Ahmedov et al.·Aug 10, 2026SaveLearn
Correlated parity violation in gravity and electromagnetism from five-dimensional spacetimeParity violation in the gravitational and electromagnetic sectors has been extensively investigated, yet the two are conventionally treated as independent phenomena. This separation, however, may be…Haomin Rao, Yunlong Zheng, Qi-Zhe Hou et al.·Aug 10, 2026SaveLearn
Detector Dependence of Inspiral Christodoulou Gravitational Wave Memory in Binary Black Hole SystemsThe nonlinear gravitational-wave memory, or Christodoulou memory effect, is a permanent displacement produced by the self-interaction of gravitational waves predicted by General Relativity. In this…Jiswin Varghese, Jyothipriya M Shaji, Lyjo K Joseph·Aug 10, 2026SaveLearn
Modified Double Copy for Quasitopological Gravity with MatterWe extend the modified double-copy construction to quasitopological gravity (QTG) coupled to matter. Spherically symmetric QTG solutions in D dimensions are generated from an auxiliary gauge field…Valeri P. Frolov·Aug 10, 2026SaveLearn
New results concerning the curvature of the UniverseOne of the fundamental questions we ask in cosmology is what the spatial curvature of the universe is. Experimental observations show that the universe is very close to being spatially flat. However,…Maxim Khlopov, Maxim Krasnov, Jan Novák·Aug 9, 2026SaveLearn
Semilinear wave equations in homothetic hyperboloidal coordinates and tail decayLate-time wave tails decay at different rates along future null infinity and along timelike worldlines at finite radius. A compactified numerical evolution must represent both the slower decay at…Anıl Zenginoğlu, Sebastiano Bernuzzi, Andrea Nützi·Aug 9, 2026SaveLearn
Solving Einstein's Vacuum Equations with Physics-Informed Neural Networks: Boundary Conditions and Domain DecompositionWe investigate the application of Physics-Informed Neural Networks (PINNs) to the numerical solution of Einstein's vacuum field equations for static spacetimes. We first reproduce the…Elly Bayona, Hernando Quevedo·Aug 9, 2026SaveLearn
Scalaron-modified null focusing and radial monotonicity in static f(R) gravityWe derive an exact radial monotonicity law for static, spherically symmetric spacetimes in metric \(f(R)\) gravity. For \(ds2=A(r)dt2-dr2/B(r)-r2dΩ2\), the matter contribution and the scalaron…Maickol Muñoz-Palma, Francisco S. N. Lobo, Jean Báez Cuevas et al.·Aug 9, 2026SaveLearn
Completing the Penrose Process without a HorizonIn its standard black-hole realization, the Penrose process uses an event horizon to remove a negative-energy fragment. We show that, at the kinematic level, horizon absorption can instead be…Yang Huang, Shiyang Hu, Bin Chen et al.·Aug 9, 2026SaveLearn
Charged Kerr--Levi-Civita geometries in Einstein--Maxwell and low-energy heterotic string theoryWe construct and compare two charged rotating extensions of the Kerr--Levi-Civita geometry. In Einstein--Maxwell theory, a fixed magnetic Kerr--Newman Ernst representative is inverted, and covariance…Haryanto M. Siahaan·Aug 9, 2026SaveLearn
EFT Corrections to Photon Propagation and Gravitational Lensing in an Ellis-Bronnikov WormholeWe investigate strong gravitational lensing by an Ellis-Bronnikov (EB) wormhole in the presence of effective field theory (EFT) corrections to photon propagation. We derive the modified photon…Takamasa Kanai·Aug 9, 2026SaveLearn
Construction of an analytic multi-component accretion environment and its application to Kerr black hole imagingThe construction of accretion environments is fundamental to black hole imaging. From a purely geometric perspective, we construct a novel analytic accretion environment comprising a geometrically…Shiyang Hu, Dan Li, Chen Deng et al.·Aug 9, 2026SaveLearn
Alternative LISA-TAIJI networks: polarization separation of the stochastic gravitational wave backgroundStochastic gravitational-wave backgrounds (SGWBs) provide a unique opportunity to probe both unresolved astrophysical populations and fundamental physics in the early Universe. Future space-based…Gang Wang, Lang Liu·Aug 9, 2026SaveLearn
Apparent horizon thermodynamics in an exponential f(Q) gravity modelWe investigate the thermodynamics of the apparent horizon in an exponential f(Q) gravity model characterized by the two parameters b and n, within a spatially flat…A. Oliveros, Ivan R. Vasquez·Aug 8, 2026SaveLearn
Exploring Particle Geodesics in a Warp Drive SpacetimeAlthough the Alcubierre Warp Drive is theoretically capable of providing faster-than-light travel, it may be difficult to use for this purpose. But is it useful for slower-than-light travel? We begin…Lucas Timotheo Sanches, Max Morris, Steven Robert Brandt·Aug 8, 2026SaveLearn
Black bounce sourced by non-minimally coupled linear electrodynamics and a canonical scalar field through a thin shell at the throatWe construct a novel class of black bounce solutions within General Relativity, sourced by a canonical scalar field non-minimally coupled to linear electrodynamics, establishing a self-consistent…Ednaldo L. B. Junior, José Tarciso S. S. Junior, Francisco S. N. Lobo et al.·Aug 8, 2026SaveLearn
Conformal-Mapping Method for Horizon Multipoles in Numerical Relativity: Implementation, Kerr Validation, and Applications Beyond AxisymmetryWe present a numerical method that constructs geometrically defined coordinates on black-hole horizons, from which the multipole moments are computed without assuming axisymmetry. This method, which…Yeong-Bok Bae, Young-Hwan Hyun, Gungwon Kang·Aug 8, 2026SaveLearn
Gravitational radiation from binary systems with time varying massesWe consider the properties of the gravitational radiation emitted by massive stars in binary systems with time varying mass, orbiting around each other in Keplerian orbits under the influence of the…Teodora M. Matei, Cristian A. Croitoru, Tiberiu Harko·Aug 8, 2026SaveLearn
Schwarzschild perturbations in Lorenz gauge via elliptic differential equationsAccurate predictions of gravitational wave signals from asymmetric compact binaries are accessible through black hole perturbation theory and self-force calculations. Faithful waveform models will…Thomas Osburn, Barry Wardell, Erin Battaglia·Aug 8, 2026SaveLearn
Mapping Schwarzschild Spacetime: From Kruskal to Diamond and Golden RepresentationsWe present several representations of the Schwarzschild spacetime. Some of these are classical, such as the embedding, Tortoise, and Kruskal representations. The latter two motivate the introduction…Edgar Alejandro León·Aug 8, 2026SaveLearn