Geometric effects of torsion on black hole ringdown and shadows in Poincaré gauge gravitySpacetime torsion provides a natural extension of general relativity and may lead to black hole solutions that differ significantly from their Einsteinian counterparts. We investigate a class of…Terkaa Victor Targema, Kazuharu Bamba, Riasat Ali et al.·Jul 13, 2026SaveLearn
Optical and thermodynamic properties of Kerr-Bertotti-Robinson black holesWe investigate the thermodynamic and optical properties of Kerr--Bertotti--Robinson black holes, namely rotating black holes immersed in an external Bertotti--Robinson electromagnetic background. In…Hassan Hassanabadi, Michael R. R. Good, Soroush Zare et al.·Jul 13, 2026SaveLearn
Higher-derivative gravitational effective field theories are generically weakly hyperbolicWe analyse the initial-value problem of metric higher-derivative effective theories of gravity. We show that any such theory whose characteristic velocities are independent of derivatives of the…Farid Thaalba, Fernando Abalos, Miguel Bezares·Jul 13, 2026SaveLearn
Corrected thermodynamics and radiation predictions of modified black bounce compact objectsWe study the thermodynamic properties and radiation characteristics of a regular compact object obtained by applying the Simpson-Visser (SV) regularisation to the Schwarzschild modified gravity black…Shokhzod Jumaniyozov, Javlon Rayimbaev, Yassine Sekhmani et al.·Jul 13, 2026SaveLearn
Universal Bounds on Black Hole Observables Imposed by Energy ConditionsWe establish a universal connection between the classical energy conditions and directly observable black hole properties. By imposing the energy conditions locally at the photon sphere, we derive…Rahul Kumar Walia, Boris Georgiev, Chi-kwan Chan·Jul 13, 2026SaveLearn
Is there ghost and tachyon free bounce in UV complete gravity theory?Analytic infinite derivative gravity theories provide a renormalizable and ghost-free description of gravity around covariantly constant backgrounds. These theories can have non-singular bouncing…Hao Hu, Alexey S. Koshelev, Abhishek Naskar·Jul 13, 2026SaveLearn
A way to constrain a graviton mass from astronomical observationsAlong with a whole range of alternative theories of gravity, variants of the massive theory of gravity, i.e. the theory of gravity, in which the graviton has mass, have been actively discussed in…Alexander F. Zakharov, Predrag Jovanovic, Dusko Borka et al.·Jul 13, 2026SaveLearn
Black-hole evaporation from the semiclassical Einstein equations in 3+1 dimensionsWe solve the semiclassical Einstein equations for an evaporating Schwarzschild black hole in closed form, obtaining its backreacted geometry in 3+1 dimensions. This is achieved by a reformulation of…Adrián del Río, F. Javier Marañón-González·Jul 13, 2026SaveLearn
Dynamics and observational signatures of warm Dirac-Born-Infeld inflation with nonminimal derivative couplingThis paper investigates a warm Dirac-Born-Infeld (DBI) inflationary model with nonminimal derivative coupling (NMDC) to gravity, where the inflaton kinetic term interacts with the Einstein tensor,…Run-Qing Zhao, Xiao-Min Zhang, Peng-Cheng Chu et al.·Jul 13, 2026SaveLearn
Sonic black holes with thick horizons in BECsWe consider simple one dimensional models of acoustic black holes formed by Bose-Einstein condensates where the flow is stepwise homogeneous. We shall concentrate on the case in which an extended…Daniel Peñalver, Marco De Vito, Roberto Balbinot et al.·Jul 13, 2026SaveLearn
Turbulence, Norm Inflation, and the Rendall Instability for the Einstein-Euler System with Positive Cosmological ConstantWe numerically study perturbations of spatially homogeneous and orthogonal solutions to the Einstein-Euler equations with positive cosmological constant and linear equation of state p=Kρ for $K ∈…Elliot Marshall·Jul 13, 2026SaveLearn
Formation of Trapped Surfaces from Spacelike Initial DataWe make use of the free data formalism developed in CK25,CK26 to provide a direct construction of short-pulse type Cauchy data. The construction of the spacelike short-pulse follows from the…Xuantao Chen, Sergiu Klainerman·Jul 13, 2026SaveLearn
Spinoptics in the presence of axion-like particles in curved spacetimeWe study the propagation of high-frequency electromagnetic waves coupled to an axionic scalar field in curved spacetime. By applying the effective action approach, we go beyond the standard geometric…Tomoki Takeuchi, Tsutomu Kobayashi·Jul 13, 2026SaveLearn
A Space Mission to Earth's Nearest Black Hole: Reality or Science Fiction?Black holes are the sources of the strongest gravitational fields in the present-day Universe, offering unparalleled opportunities to test Einstein's theory of General Relativity in the…Cosimo Bambi·Jul 13, 2026SaveLearn
How a minimal length scale modifies thermodynamics of RN AdS Black Holes?We investigate the thermodynamic modifications of the Reissner-Nordstroem anti-de Sitter (RN AdS) black hole induced by a minimal length scale,which naturally emerges in κ-deformed space-time. By…Suman Kumar Panja, Yu Shi·Jul 13, 2026SaveLearn
Chaplygin and Polytropic Kantowski--Sachs Solutions in Teleparallel F(T) GravityA covariant reconstruction framework for Kantowski--Sachs (KS) geometries sourced by Chaplygin-type and polytropic fluids in teleparallel F(T) gravity is developed using the…Alexandre Landry·Jul 13, 2026SaveLearn
Static regular black holes in Horndeski theories: analytic no-go and nonanalytic obstructionsRegular black holes in Horndeski theories must have stable horizons and regular centers. We study static, spherically symmetric, asymptotically flat configurations with a time-independent scalar. The…Antonio De Felice, Shinji Tsujikawa·Jul 13, 2026SaveLearn
Electromagnetic Kantowski--Sachs Solutions in Teleparallel F(T) GravityA covariant reconstruction framework for electromagnetic Kantowski--Sachs (KS) geometries in teleparallel F(T) gravity is developed using the coframe/spin-connection (CSC) formalism and the…Alexandre Landry·Jul 13, 2026SaveLearn
Static Spherically Symmetric Chaplygin and Polytropic Fluid Solutions in Teleparallel F(T) GravityWe investigate static, spherically symmetric (SS) spacetimes in covariant teleparallel F(T) gravity sourced by nonlinear Chaplygin and polytropic fluids. Using the covariant coframe/spin-connection…Alexandre Landry·Jul 13, 2026SaveLearn
Universal thermodynamic topological classes of the charged dRGT black stringIn this study, we explore universal thermodynamic topological classes of charged dRGT black string within both the canonical ensemble and grand canonical ensemble frameworks, and further analyze its…Hao Chen, Meng-Yao Zhang, Yi Yang et al.·Jul 13, 2026SaveLearn
Teleparallel F(T) electromagnetic static spherically symmetric spacetime solutionsWe investigate static, spherically symmetric (SS) spacetimes in covariant teleparallel \(F(T)\) gravity in the presence of electromagnetic sources. Starting from the coframe/spin-connection (CSC)…Alexandre Landry·Jul 13, 2026SaveLearn
Scalar-Tensor Gravity as a Probe of Generalized Black Hole EntropyWe develop a geometric realization of a broad class of generalized black hole entropy functionals by establishing their direct correspondence with the Misner-Sharp quasilocal mass and the Wald…Hussain Gohar·Jul 13, 2026SaveLearn
Gauge-covariant Raychaudhuri dynamics for spin-nondegenerate Lorentz-violating congruencesWe investigate the Raychaudhuri dynamics of charged spin-nondegenerate Lorentz-violating particle congruences under minimal electromagnetic coupling. The coupling is introduced through the…A. A. Araújo Filho, A. F. Santos, J. A. A. S. Reis et al.·Jul 13, 2026SaveLearn
Reshaping the inner shadow of a Kerr black hole by a torn accretion diskWhen an accretion flow extends to the event horizon, their intersection defines the contour of the inner shadow. However, the morphological evolution of this critical feature remains largely…Shiyang Hu, Dan Li, Chen Deng et al.·Jul 13, 2026SaveLearn
Post-Newtonian Constraints on Scalar-Tensor GravitySolar-System constraints on a general scalar-tensor theory with generic non-minimal coupling function, non-canonical kinetic function, and scalar potential, are investigated in both the metric and…Alexandros Karam, Samuel Sánchez López, José Jaime Terente Díaz·Jul 13, 2026SaveLearn