Finite-Momentum Kinetic Corrections to Viscous Tensor Perturbations in an Expanding UniverseWe study tensor perturbations propagating through a viscous relativistic medium in a spatially flat FLRW universe, with particular emphasis on the correction produced by spatial free streaming beyond…Nishil Savla, Gurudatt Gaur·Aug 20, 2026SaveLearn
Can Stochastic Clocks in FLRW Minisuperspace Prevent Dynamical Singularities?We develop a stochastic extension of the Wheeler--DeWitt equation in FLRW minisuperspace and show that quantum backreaction can dynamically regulate the big bang singularity without imposing external…Pradosh Keshav MV·Aug 20, 2026SaveLearn
Open quantum system approach to the Unruh-DeWitt detector in impulsive plane wave spacetimesIn this paper we employ the open quantum system framework with the influence functional formalism to non-perturbatively analyze the response of an Unruh-DeWitt detector modeled as a harmonic…Hing-Tong Cho·Aug 20, 2026SaveLearn
Generalized Polytropic Regular Black Holes in Arbitrary DimensionsWe investigate static, spherically symmetric regular black holes with anti-de Sitter (AdS) asymptotics in arbitrary spacetime dimensions. They are solutions of Einstein gravity, sourced by an…Seyed Naseh Sajadi, Supakchai Ponglertsakul, Petarpa Boonserm et al.·Aug 20, 2026SaveLearn
A New Method for Quasinormal Modes From Bound States and Homotopy deformationsInspired by Mashhoon's bound state method, we propose a new bound state method for computing quasinormal modes (QNMs). By a two-step coordinate transformation where a real parameter α is…Hao-Yun Ma, Bo-Yun Zhou, Jia-Hui Huang·Aug 20, 2026SaveLearn
Optimal Extension Regularity at the McVittie Event HorizonWe determine the optimal local extension regularity of the future black-hole event horizon in the exact spatially flat McVittie solutions sourced by a positive cosmological constant and a barotropic…Yi-kun Li·Aug 20, 2026SaveLearn
Spacetimes via Continuous posets: Old foundations and new developmentsWe introduce the reader to the continuous posets approach to spacetime geometry, a topic pioneered by Martin and Panangaden. We provide all relevant proofs from standard domain-theory sources to ease…Ettore Minguzzi·Aug 19, 2026SaveLearn
Action-level characterization of gravitational-wave propagation in dynamical Barbero--Immirzi gravityWe investigate which operators in first-order dynamical Barbero--Immirzi (BI) gravity control cosmological tensor propagation at the action level. Within a bosonic, two-derivative, curvature-linear…Zhi-Fu Gao, Hui Wang, Luiz Carlos Garcia de Andrade et al.·Aug 19, 2026SaveLearn
Breakdown of Hydrodynamic Universality in Neutron Star OscillationsHydrodynamic universality refers to the property that different formulations of relativistic dissipative hydrodynamics yield identical predictions in the asymptotic long-wavelength regime. We show…Gabriel S. Denicol, Amanda Guerrieri, João V. M. Muniz et al.·Aug 19, 2026SaveLearn
Quasinormal Modes, Partial Transmission Probabilities, and Hod's Conjecture of Charged Black Holes in Perfect Fluid Dark Matter within Kalb-Ramond GravityWithin the Kalb-Ramond field-induced Lorentz-violating gravity, we investigate the perturbation dynamics and quasinormal mode (QNM) spectra of a charged black hole immersed in perfect fluid dark…Zongyuan Qin, Zheng-Wen Long·Aug 19, 2026SaveLearn
On entropic cosmology, late time acceleration and the quantum bounceIn this work, we present a unified entropic description of the quantum bounce that is present in Loop Quantum Cosmology (LQG) and dark energy that drives the late time acceleration of the Universe.…Luis Rey Diaz-Barron, G. E. Pérez-Cuéllar, M. Sabido·Aug 19, 2026SaveLearn
Notes on Kerr-Bertotti-Robinson SpacetimeThe surface r=∞ of the Kerr--Bertotti--Robinson (KBR) spacetime is not the collection of the endpoints of infinitely extended light rays, and the Coulomb type component of gravitational field…Yu-Sen Zhou, Liang-Bi Wu, Ming-Fei Ji et al.·Aug 19, 2026SaveLearn
Duru-Kleinert Path Integral in Unimodular Quantum CosmologyThe Wheeler-DeWitt equation of a flat Friedmann-Lemaitre-Robertson-Walker universe filled with pressureless dust and a cosmological constant in the unimodular gravity is recently shown to be…Xiao-Kan Guo·Aug 19, 2026SaveLearn
A Quantum-Gravity-Motivated GUP Effective MetricRecent critiques have addressed certain aspects of the generalized uncertainty principle (GUP) effective metric (Ong 2023). This study presents a scale-dependent quadratic GUP effective metric,…M. H. Al Ghifari, M. F. Fauzi, A. Rohim et al.·Aug 19, 2026SaveLearn
Effective curvature coupling of link-based causal set propagators in 1+1 dimensionsWe study how a recently introduced causal-set propagator defined in terms of links responds to curvature. On sprinklings embedded in a flat 1+1-dimensional Minkowski space, this propagator is known…Arsim Kastrati·Aug 19, 2026SaveLearn
On uniqueness of non-vacuum stationary axisymmetric type D spacetimeWe study a family of the non-vacuum stationary axisymmetric type D metrics, where the two principal null directions are geodesic and shearfree. It is demonstrated that the conformal-to-Carter metric…Hiroaki Nakajima, Ya Guo, Wenbin Lin·Aug 19, 2026SaveLearn
First Law of Black Hole Interior DynamicsWe obtain a local first law of dynamics within the interior geometries that are governed by cosmological solutions connecting the event horizon and the Kasner-like singularity. Evaluating the…Ze-Xuan Xiong, H. Lu·Aug 19, 2026SaveLearn
Covariant Energy Momentum Tensor in General Relativity by Generalized Canonical MethodDefining a complete and covariant energy-momentum tensor in general relativity is a longstanding issue of concern. A widely attempted approach is to define it as a pseudo-tensor in an asymptotic…Masakatsu Kenmoku·Aug 19, 2026SaveLearn
Bounds on the Lyapunov Exponent of Circular Null Orbits in n-Dimensional Black-Hole SpacetimesUnstable circular null orbits provide a geometric bridge between black-hole optics, photon rings, strong gravitational lensing, and the eikonal sector of quasinormal ringing. In four-dimensional…Anagha V., C. Fairoos, T. K. Safir·Aug 19, 2026SaveLearn
Thermodynamics, topology and non-Abelian instability of the five-dimensional Einstein--Yang--Mills black hole with exponential entropy correctionThe five-dimensional Einstein--Yang--Mills black hole obtained from the higher-dimensional Wu--Yang ansatz carries a logarithmic non-Abelian contribution to the metric function, making it an…Aram Bahroz Brzo, Peshwaz Abdulkareem Abdoul, Behnam Pourhassan et al.·Aug 18, 2026SaveLearn
Renormalization group improved black holes in non-commutative momentum-dependent spacetime geometryWe investigate black holes (BHs) in momentum-dependent spacetime geometry and assess its quantum Reissner-Nordström (RN) consistency with the weak gravity conjecture (WGC). Quantum corrections are…Gema Ilham Baskara Darman, Ar Rohim, Anto Sulaksono·Aug 18, 2026SaveLearn
Relational Wigner-Smith Duration in Wheeler-DeWitt ScatteringA closed Friedmann-Lemaitre-Robertson-Walker Wheeler-DeWitt model is formulated as an exact reflection problem. The derivative of its reflection phase defines a relational crossing duration whose…Daulet Berkimbayev·Aug 18, 2026SaveLearn
On the Tidal and Frame-Drag Fields in General RelativityIt is known that in vacuum, two infinitesimally separated timelike observers under free fall notice a relative acceleration due to the tidal field (or the `electric' part of the Weyl tensor), and…Rahulkumar Solanki·Aug 18, 2026SaveLearn
Chromatic Weak Lensing by Charged Black Holes with Two Lorentz-Violating Kalb-Ramond CouplingsWe study weak gravitational lensing and steady spherical test--fluid accretion by a static charged black hole in a Lorentz--violating Kalb--Ramond background with two nonminimal curvature couplings,…Ali Övgün, Reggie C. Pantig, Grigoris Panotopoulos·Aug 18, 2026SaveLearn
Curvature-induced phantom behavior and cosmological bounces without violating the Dominant Energy ConditionWe show that a spatially closed universe can exhibit effective phantom dynamics (q<-1) and reach a finite-time cosmological event without violating the Dominant Energy Condition (DEC). Whereas the…Miguel Cruz, Samuel Lepe·Aug 18, 2026SaveLearn