Nonlinear electrodynamics in Kerr-Newman-NUT-Λ spacetime: exact solutions, horizons, and energy conditionsWe construct two exact nonlinear-electrodynamic generalizations of the Kerr-Newman-NUT-Λ spacetime. Imposing alignment between the principal directions of the electromagnetic field and the metric…Oscar Galindo-Uriarte, Nora Breton, Claus Lämmerzahl et al.·Jul 25, 2026SaveLearn
Quasinormal modes of a quantum inspired black hole in four dimensions with cosmological constantWe study the scalar and Dirac perturbations of quantum-corrected black holes with cosmological constant. Using two different methods (WKB and double-null characteristic integration) we compute the…R. D. B. Fontana, Jeferson de Oliveira, B. Eslam Panah et al.·Jul 25, 2026SaveLearn
Non-Equilibrium Physics of Thermodynamicized Black HolesThis work presents a non-equilibrium framework for thermodynamicized black holes, inspired by the entropy-functional interpretation of emergent gravity and by residue-based methods in black hole…Wen-Xiang Chen·Jul 25, 2026SaveLearn
Robustness of Starobinsky inflation in a minimal two-field scalar-tensor completionWe investigate whether the Starobinsky inflation remains robust after including a minimal scalar extension motivated by the one-loop effective action of scalar-tensor gravity. We numerically solve…Boris Latosh·Jul 25, 2026SaveLearn
The Steep Price of No Hair in a Modified Loop Quantum CosmologyA modified version of loop quantum cosmology model, the so-called mLQC-I, motivated by Thiemann's regularization of the Hamiltonian constraint, leads to the resolution of the big bang singularity…Meysam Motaharfar, Parampreet Singh·Jul 25, 2026SaveLearn
Analytic force-free jet from disk-fed rotating black holesWe present a new analytic model of a force-free electromagnetic jet launched from a disk-fed rotating black hole. The jet solution is force-free to first order in the black hole spin and is obtained…Luis Villarin, Ian Vega·Jul 25, 2026SaveLearn
Atomic clocks and gravitational waves as probes of non-metricityNon-metricity provides a natural extension of Riemannian geometry, yet its experimental signatures remain largely unexplored. In this work, we investigate how spacetime non-metricity can be probed…Mohsen Khodadi, Emmanuel N. Saridakis·Jul 25, 2026SaveLearn
Threshold Resolvent Singularities and the Infrared Structure of Linearized GravityWe identify a sharp geometric threshold governing the infrared spectral behavior of the spatial Lichnerowicz operator on asymptotically flat three-dimensional manifolds. Let (M,g) be asymptotically…Michael Wilson·Jul 25, 2026SaveLearn
Finite-cutoff holography and quasilocal thermodynamics of BTZ black holes in a cavityWe show that the BTZ black hole in a finite radial cavity realizes a closed finite-cutoff thermodynamic system whose renormalized Brown-York stress tensor is simultaneously the quasilocal stress…Nazir A. Ganaie·Jul 25, 2026SaveLearn
Jordan-like invariant representations of scalar-tensor gravity and the return of imperfect-fluid thermodynamicsIt has been shown that the thermodynamics of frame-invariant scalar-tensor gravity admits an Einstein-frame-like invariant representation, in which the scalar sector is minimally coupled and behaves…David S. Pereira, José Pedro Mimoso·Jul 24, 2026SaveLearn
Radiative losses from unbound orbits at quadratic order in spin from MPM formalismWe study the spinning two-body system in the aligned spin case for hyperboliclike motions computing all radiative losses (at the 2PN absolute accuracy and including spin-squared corrections) using…Donato Bini, Giorgio Di Russo·Jul 24, 2026SaveLearn
Universal relations applied to proto-neutron star generated gravitational waves from three-dimensional core collapse supernova simulationsUsing asteroseismology techniques, several relations have been developed that relate the quasi-normal, non-radial oscillation mode frequencies of the proto-neutron star (PNS) to the high frequency…R. Daniel Murphy, Anthony Mezzacappa, Colter J. Richardson et al.·Jul 24, 2026SaveLearn
Casimir traversable wormholes in Gauss-Bonnet gravityIn this work, we study Casimir wormhole solutions and investigate satisfaction of energy conditions in the framework of Einstein-Gauss-Bonnet (EGB) gravity. We firstly find traversable wormhole…Mohammad Reza Mehdizadeh, Amir Hadi Ziaie·Jul 24, 2026SaveLearn
Vaidya-Type Solutions of Quasitopological Gravity Interacting with Nonlinear ElectrodynamicsWe construct Vaidya-type solutions of quasitopological gravity coupled to nonlinear electrodynamics in arbitrary spacetime dimensions. Starting from the corresponding static spherically symmetric…Valeri P. Frolov, Chul-Moon Yoo, Andrei Zelnikov·Jul 24, 2026SaveLearn
Entropic Chaplygin-Gas cosmology and late-universe tension diagnosticsPersistent discrepancies between early- and late-Universe measurements have made cosmological tensions a major test of the standard ΛCDM model. We investigate whether an entropic generalized…Kelvis A. Kulhkampa, Carlos H. Coimbra-Araújob, Abraão J. S. Capistrano et al.·Jul 24, 2026SaveLearn
Les Houches lectures on Spinfoam Path IntegralsIn these lecture notes for the Les Houches School on Loop Quantum Gravity 2025, which took place in September 2025, we give a pedagogical review of the basics of the spinfoam framework for a quantum…Oleksandra Hrytseniak, Etera R. Livine, Valentine Maris·Jul 24, 2026SaveLearn
Light deflection in general static and spherically symmetric spacetime with a homogeneous plasmaWe developed in this work a perturbative technique to compute the deflection angle of light rays in general static and spherically symmetric spacetimes with a homogeneous non-magnetic plasma. The…Guanming Li, Zhongze Li, Junji Jia·Jul 24, 2026SaveLearn
When does a sphere fall like a point particle? Quadrupole universality and Weyl-driven hexadecapole deviations in vacuum general relativityWe ask when a spinless spherical extended test body in vacuum general relativity moves as its point-particle counterpart. In Newtonian gravity, harmonicity of the external potential gives an…Tiago S. Amancio, Ricardo A. Mosna, Ronaldo S. S. Vieira·Jul 24, 2026SaveLearn
The macroscopic precession model of quasi-periodic oscillations for rotating compact objectsThe relativistic precession model (RPM) interprets the twin kilohertz quasi-periodic oscillations (QPOs) as geodesic frequencies of test particles orbiting in the spacetime of X-ray binaries hosting…Orlando Luongo, Marco Muccino·Jul 24, 2026SaveLearn
Dynamical Baryogenesis in Rainbow CosmologyWe investigate baryogenesis in the framework of rainbow cosmology employing a complex scalar field with a softly broken global U(1)-symmetry. The modified dispersion relation of rainbow cosmology…Surendra Kumar Gour, Malay K. Nandy·Jul 24, 2026SaveLearn
Static vacuum metrics in (4 + 1) dimensions with Λ < 0 and squashed conformal infinityWe construct numerically two families of static five-dimensional Lorentzian metrics, solutions of vacuum Einstein equations with a negative cosmological constant, one with and one without a black…Piotr T. Chruściel, Jiaxin Song, Raphaela Wutte et al.·Jul 24, 2026SaveLearn
Dynamical and Observational Analysis of Generalized Nash's Theory of GravityWe investigate cosmic evolution in generalized Nash's theory of gravity involving the quadratic Ricci invariant χ=RμνRμν. The analysis is divided into two complementary branches. First,…Amin Rezaei Akbarieh, Mohammad Amin Bolouri, Yaghoub Heydarzade·Jul 24, 2026SaveLearn
Charged Black Holes in Einstein--U(1) Gravity with Letelier--Alencar Cloud of Strings: Thermodynamics and QPO-Based Observational ConstraintsIn this study, black hole solutions are derived within the framework of Einstein gravity, coupled to a U(1) gauge field in the presence of both the Letelier--Alencar cloud of strings and…B. Eslam Panah, Bidyut Hazarika, Prabwal Phukon·Jul 24, 2026SaveLearn
Notes on gravitational wave amplitude evolution beyond null geodesicsIn these notes, we extend a formalism for computing the amplitude of gravitational-waves (GWs) beyond null-geodesic propagation, as may arise in alternative theories of gravity. We derive the…Charles Dalang·Jul 24, 2026SaveLearn
Kerr--NUT--Levi-Civita geometries from Ernst inversion: axis structure, curvature singularities, and the Manko--Ruiz parameterWe construct and analyze stationary, axisymmetric vacuum metrics obtained by magnetic Ernst inversion of Kerr-NUT with Manko-Ruiz parameter C and pre-inversion twist constant β. The…Haryanto M. Siahaan·Jul 24, 2026SaveLearn