Some remarks on the horizon in the dust cloud collapseWe examine the existence of an apparent horizon in the collapse of an isolated dust cloud using expansion functions. Our results indicate that in the region of spacetime far away from the…Koushiki, W. Piechocki, G. Plewa·Mar 22, 2026SaveLearn
Cosmology with Logarithmic Corrected Horizon Entropy According to the Generalized Entropy and Variable-G CorrespondenceAccording to the GEVAG (Generalized Entropy Varying-G) framework, any modification to the Bekenstein-Hawking area law would also lead to a varying-G gravity theory in which the effective…Chen-Hao Wu, Yen Chin Ong·Mar 22, 2026SaveLearn
Analytical polyΛCDM dynamicsWe develop a novel analytical dynamical analysis to derive precise energy density ratio evolutions for the ϕCDM and polyΛCDM models, comparing them to the standard ΛCDM model and validating…Pierros Ntelis, Jackson Levi Said·Mar 22, 2026SaveLearn
Polytropes, logotropes, the universal value of the surface density of dark matter halos, and the value of the cosmological constantWe discuss the connection between logotropes and polytropes in astrophysics and cosmology. The logotropic equation of state P=A(ρ/ρP) may be seen as a degenerate form of the polytropic equation…Pierre-Henri Chavanis·Mar 22, 2026SaveLearn
A new approach towards the construction of initial data in general relativity with positive Yamabe invariant and arbitrary mean curvatureThis paper revisits the classical construction of initial data using the conformal method, as originally proposed by Holst, Nagy, and Tsogtgerel and later refined by Maxwell. We demonstrate that the…Armand Coudray, Romain Gicquaud·Mar 22, 2026SaveLearn
Causal Structure of Spacetime Singularities and Their Observable SignaturesWe analyze the causal structure of horizonless compact objects via the light-cone geometry and conformal compactification of the Joshi-Malafarina-Narayan (JMN-1) and Janis-Newman-Winicour (JNW)…Bina Patel, Jahnvi Mistry, Ayush Bidlan et al.·Mar 22, 2026SaveLearn
Symmetry evolution for the imperfect fluid under perturbationsEver since a new symmetry was found for the imperfect fluid with vorticity the question of the effect of perturbations on the symmetry itself has been raised. This new symmetry arose when realizing…Alcides Garat·Mar 22, 2026SaveLearn
Isotropic Coordinates for Generalized Schwarzschild-like SolutionsWe consider a broad class of static, spherically symmetric generalized Schwarzschild-like solutions with multiple non-interacting anisotropic fluid sources and derive the coordinate transformation…Zeyu Zeng, Elena Kopteva·Mar 22, 2026SaveLearn
Second-Order Bi-Scalar-Vector-Tensor Field Equations Compatible with Conservation of Charge in a Space of Four-DimensionsThe purpose of this paper is to explore, in a space of four-dimensions, the possible forms that second-order, bi-scalar-vector-tensor field equations derivable from a variational principle can…Gregory W. Horndeski·Mar 21, 2026SaveLearn
Detection of Gravitational Wave modes in third generation detectorsWe investigate the detectability of Gravitational Wave (GW) modes (emitted by black-holes and neutron stars) by third generation, ground-based gravitational wave detectors planned to be operational…Massimo Tinto, Sanjeev Dhurandhar, Harshit Raj·Mar 21, 2026SaveLearn
First-principle evolution Hamiltonian operator: derivation from ADM quantum constraints and quantum reference-frame conditionsFor any Dirac theory of quantum gravity governed by a set of well-defined quantum constraints, we discover a universal formula for the exact form of the evolution Hamiltonian operator in a variable…Chun-Yen Lin·Mar 21, 2026SaveLearn
Generalized JMN Naked Singularity ModelsWe construct a generalized class of Joshi-Malafarina-Narayan (JMN) naked singularity spacetimes that arise as equilibrium end states of gravitational collapse with non-vanishing tangential pressure.…Jay Verma Trivedi, Pankaj S. Joshi·Mar 21, 2026SaveLearn
Breaking the degeneracy among regular black holes with gravitational lensingWe examine parameter degeneracies in Culetu, Bardeen and Hayward regular black holes across lensing, shadow and quasinormal mode regimes. Our analysis reveals that while Einstein ring data yield…Hong Liu, Xiaolong Liao, Yi Zhang·Mar 21, 2026SaveLearn
A Rigorous Jacobi-Metric Approach to the Gauss-Bonnet Lensing of Spinning Particles: Extension to Quadrupole OrderIn this paper, we establish a generalized geometric framework based on the Gauss-Bonnet theorem and the Jacobi metric to investigate the gravitational deflection of massive spinning particles up to…Hoang Van Quyet·Mar 21, 2026SaveLearn
Branch-dependent ringdown in black-bounce spacetimes: imprints of matter-source ambiguity on quasinormal modesRegular black holes and black-bounce spacetimes frequently emerge in theoretical frameworks beyond general relativity, as well as in general relativity coupled to non-linear sources. A profound…Hao Yang, Chen Lan·Mar 21, 2026SaveLearn
Canonical and Grand-Canonical Singular Ensembles within a Thermodynamicized Gravity FrameworkThis paper develops a gravitational-thermodynamic interpretation of two ensemble structures with singular behavior, denoted as canonical ensemble A and grand canonical ensemble B. Ensemble A is…Wen-Xiang Chen·Mar 21, 2026SaveLearn
Universality in static spherically symmetric solutions of f(R) gravityf(R) gravity is a well-known modification of General Relativity, that can be reduced to a scalar-tensor theory by a conformal transformation (Einstein frame). We study static spherically symmetric…Valery I. Zhdanov·Mar 21, 2026SaveLearn
Nonlinear tails in the Kerr black hole ringdownPower law tails induced by nonlinearities of General Relativity (``sourced'' or ``nonlinear'' tails) were recently shown to dominate the late time waveform of Schwarzschild black hole…Siyang Ling, Sam S. C. Wong·Mar 20, 2026SaveLearn
Angular momentum tail contributions to compact binary dynamicsWe derive the effective action governing the dynamics of a compact binary system when gravitational radiation is emitted by any mass or current multipole, scattered by the quasi-static field…Gabriel Luz Almeida, Alan Müller, Stefano Foffa et al.·Mar 20, 2026SaveLearn
Analytical Solution of Spinning, Eccentric Binary Black Hole Dynamics at the Second Post-Newtonian OrderRecent gravitational wave (GW) detections showing signatures of eccentricity and spin precession underscore the need to model binary black holes (BBHs) possessing these features simultaneously. Most…Tom Colin, Sashwat Tanay, Laura Bernard·Mar 20, 2026SaveLearn
Modeling the merger-ringdown of an eccentric test-mass inspiral into a Kerr black hole using the effective-one-body frameworkWe characterize and phenomenologically model the merger-ringdown of gravitational waves emitted by a small compact object that plunges and merges into a Kerr black hole from equatorial-eccentric…Guglielmo Faggioli, Alessandra Buonanno, Maarten van de Meent et al.·Mar 20, 2026SaveLearn
Singular structures and causality of the Schwarzschild Green's function in the frequency domainWe study two singular spectral components of the Green's function of a Schwarzschild black hole and their interpretation in the frequency domain: (i) the low-frequency branch cut, which yields…Romeo Felice Rosato, Marina De Amicis, Paolo Pani·Mar 20, 2026SaveLearn
White Dwarf Structure in f(Q) GravityIn this work, we investigate the equilibrium structure of white dwarfs within the covariant formulation of symmetric teleparallel f(Q) gravity, in which gravity is described by the nonmetricity…Rajasmita Sahoo·Mar 20, 2026SaveLearn
Casimir-Induced Quintessence in Dark DimensionWe investigate a concrete realization of the Dark Dimension scenario, where a single large extra dimension is set at sub-millimeter scales. In this framework, the Casimir energy of bulk fields…Tomoki Katayama, Hiroki Matsui, Yuri Michinobu et al.·Mar 20, 2026SaveLearn
Chaotic motion and power spectral density in Schwarzschild Bertotti-Robinson black hole spacetimeIn this paper, we show that in weak field limit Schwarzschild Bertotti-Robinson black hole (Schwarzschild-BR BH) turns into Schwarzschild black hole immersed in external uniform magnetic field which…Yunqiao Xu, Uktamjon Uktamov, Pierros Ntelis et al.·Mar 20, 2026SaveLearn