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
Detecting gravitational waves by emission of photons from charged Weber barsIn this work, we propose a novel experimental set-up using charged resonant gravitational wave detectors. We exploit the semi-classical analogue of the Gertsenshtein effect where the gravitational…Soham Sen·Jul 13, 2026SaveLearn
Observational Signatures of Rotating Ayón-Beato-García Black Holes: Shadows, Accretion Disks and ImagesWe investigate the shadows, accretion disks, and observational images of rotating Ayón-Beato--Garc\'ıa (ABG) black holes with mass M, spin a, and nonlinear-electrodynamics (NLED) charge…Zhenglong Ban, Meng Chen, Rong-Jia Yang·Jul 13, 2026SaveLearn
Lagrangian Identity and Mass Evolution of Particle-like Objects in Nonminimally Coupled GravityWe show that the Lagrangian of a Nambu-Goto p-brane satisfies the identity L [ p ]=T [ p ]/(p+1), with T [ p ] denoting the trace of the…S. R. Pinto, P. P. Avelino·Jul 13, 2026SaveLearn
Emergent inflation in fractional cosmologyWe investigate the evolution of the early universe within the proposed fractional cosmological framework. The underlying formulation is conceptually rooted in generalized measure constructions,…S. M. M. Rasouli·Jul 13, 2026SaveLearn
Signatures of a subpopulation of hierarchical mergers in the GWTC-4 gravitational-wave datasetRepeated black-hole mergers in dense stellar clusters are a plausible mechanism to populate the predicted gap in black hole masses due to the pair-instability supernova process. These hierarchical…Cailin Plunkett, Thomas Callister, Michael Zevin et al.·Jul 13, 2026SaveLearn
A New Definition of Horndeski Theory and the Possibility of Multiple Scalar Field ExtensionsIn the single-field case, Horndeski provides the most general scalar-tensor theory with second-order field equations. By contrast, systematic multi-field extensions remain incomplete: while the…Tomoki Katayama·Jul 13, 2026SaveLearn
Gravitational waves in Cubic Metric-Affine GravityWe derive new exact gravitational wave solutions with dynamical torsion and nonmetricity tensors in the framework of cubic Metric-Affine Gravity (MAG). For this purpose, we consider the full…Sebastian Bahamonde, Jorge Gigante Valcarcel, José M. M. Senovilla·Jul 13, 2026SaveLearn
Metric reconstruction and the Hamiltonian for eccentric, precessing binaries in the small-mass-ratio limitWe calculate the first-order (in the mass-ratio) metric perturbation produced by a small body on an eccentric, precessing bound orbit about a Kerr black hole. We reconstruct the metric perturbation…Zachary Nasipak·Jul 13, 2026SaveLearn
Inflaton Dynamics in Higher-Derivative Scalar-Tensor Theories of GravityDuring inflation, higher derivative terms in the gravitational action may play a significant role. Building on new stable formulations of four-derivative scalar-tensor theories, we study the impact…Sam E. Brady, Katy Clough, Pau Figueras et al.·Jul 13, 2026SaveLearn