Constraining Ultralight Dark Matter in Dynamical Dark Energy CosmologiesWe investigate the cosmological implications of scalar-field dark matter (SFDM) in a dynamical dark energy framework, extending previous analyses that considered SFDM within the standard ΛCDM…Muhammad Awais, Hafiz Inam Ullah, Rafael C. Nunes et al.·Oct 23, 2026SaveLearn
Neutron Star--Primordial Black Hole Binaries: Dynamical Tides, Resonance Locking, and Gravitational WavesThe orbital evolution of a neutron star and a much lower-mass primordial black hole can differ strikingly from that of typical compact binaries. Dynamical tides, analogous to those in the Solar…Isaac Legred, Nicolás Yunes·Oct 23, 2026SaveLearn
Impact of nonlinear electrodynamics on quasinormal modes of rotating black stringsWe study massless scalar perturbations of rotating anti-de Sitter black strings sourced by a power-Maxwell field with negative exponent s. The charge enters the metric function as -Qrp with…F. S. Mirekhtiary, I. Sakalli·Oct 23, 2026SaveLearn
Hyperboloidal Initial Data with Prescribed Asymptotic ChargesA novel method is introduced for constructing hyperboloidal initial data with direct analytic control over asymptotic charges prior to solving the Einstein constraint equations. Using the…Károly Csukás, János Östör, István Rácz·Oct 23, 2026SaveLearn
Black holes from a nonlocal equation of state: horizon geometry, singularity structure and thermodynamicsWe show that a nonlocal equation of state for an anisotropic fluid reduces to a linear equation for the enclosed matter and uniquely selects a Yukawa-type density profile in a static, spherically…Hishan Farfán-Bachiloglu, C. R. Muniz, Francisco Tello-Ortiz·Oct 23, 2026SaveLearn
A unified dark sector from a single canonical scalar field in Bohmian Wheeler-DeWitt cosmology with a cuscuton-inspired potentialWe quantize a spatially flat FLRW minisuperspace containing one canonical scalar field with the hyperbolic potential generated by a cuscuton-type superpotential, and extract cosmological histories…Anant Badal, Rikpratik Sengupta, Kaushik Bhattacharya·Oct 23, 2026SaveLearn
Observational constraints on a non-minimally coupled scalar field in non-metricity gravity with an extra degree of freedomWe investigate a non-minimally coupled scalar field in non-metricity gravity, adopting a non-trivial connection class in spatially flat FLRW spacetimes. In contrast to the coincident-gauge choice,…Saddam Hussain, Ghulam Murtaza, Avik De·Oct 23, 2026SaveLearn
The Evolution of Self-Gravitating Radiating Geodesic Fluid Spheres Instantaneously Admitting a Time-Like KillingIn this study we analyze the effects produced by the sudden appearance of a time-like Killing vector (TKV), on the evolution of radiating geodesic fluids. This is achieved by resorting to the concept…L. Herrera, A. Di prisco·Oct 23, 2026SaveLearn
Relativistic PlasticityThe elastic crust of a neutron star has long been established as a key player in relevant aspects of neutron star physics. However, the state-of-the-art theory of elasticity is restricted to the…Joshua, Cadogan, Nils Andersson et al.·Oct 23, 2026SaveLearn
First-Order Structure of the Linearised Einstein Equations: Constant-Curvature BackgroundsTeukolsky's decoupled equations and Wald's adjoint method of metric reconstruction are built from second-order operators: the linearised Einstein operator G, the curvature-extraction operator…Kirill Krasnov, Adam Shaw·Oct 23, 2026SaveLearn
Entanglement entropy of evolving wormholesWe compute the entanglement entropy of a discretized scalar field in the fixed spacetime background of an evolving wormhole. Evolving wormholes are a class of time dependent and spherically symmetric…Ben Kain, Hong Y. Ling·Oct 23, 2026SaveLearn
Stochastic dynamics of cosmological inflation in general relativityThe theory of Inflation, supplemented by fluctuations of the quantum vacuum, is the leading paradigm to explain the correlations of inhomogeneities at very large distances in the Universe. Particle…Yoann L. Launay·Oct 23, 2026SaveLearn
The fate of primordial gravitational waves during domain-wall dominationPrimordial gravitational waves probe inflation, but their interpretation depends on their subsequent evolution. During domain-wall domination, a frozen wall network retains a nonzero shear response…Zhen-Min Zeng·Oct 23, 2026SaveLearn
Scalar-Field Singularities and Cyclic Cosmology in Brans-Dicke TheoryWe investigate a Brans-Dicke cosmological model with a scalar-field potential and derive an analytical solution for a power-law ansatz for the scalar field. The resulting cosmological evolution…Konrad Marosek, Adam Balcerzak·Oct 23, 2026SaveLearn
Closure of Traceful Radiation-Gauge Reconstruction with Matter: General Kerr Conditions, a Thin-Shell Benchmark, and a Conserved TorusWe formulate the closure problem for first-order, traceful radiation-gauge metric reconstruction on a Kerr background with matter. The reconstruction is decomposed into Weyl-curvature, Ricci-trace,…G. G. L. Nashed·Oct 22, 2026SaveLearn
Finite-distance effects and scalar suppression in massive gravityPulsar timing arrays (PTAs) probe the stochastic gravitational wave (GW) background through the angular cross-correlations of timing residuals. For a GW background in general relativity (GR), the…Chris Choi, Tina Kahniashvili, Barnabás Póczos·Oct 22, 2026SaveLearn
Gauge Invariant Frames of Bianchi Models in Separated FormBianchi spacetimes are usually written in separated form: metric coefficients depend only on cosmic time, while spatial dependence is carried by an invariant coframe. In this representation,…Dave B. H. Verweg, Robbert W. Scholtens·Oct 22, 2026SaveLearn
Minkowski metric signature as a statistical prediction of piecewise-flat quantum gravityWe study an ab initio calculation of the signature of the spacetime metric, within the framework of piecewise-flat models of quantum gravity. Applying numerical techniques, we evaluate the…Mihailo Djordjevic, Igor Prlina, Marko Vojinovic·Oct 22, 2026SaveLearn
Non-Markovian Cosmology with Causal Memory KernelsWe investigate a non-Markovian extension of Friedmann cosmology in which the present expansion rate retains information about the past cosmic evolution through a causal memory kernel, with …Aritra Sanyal, Prabir Rudra·Oct 22, 2026SaveLearn
Perturbations and phenomenology of compact objects in quantum gravity theoriesThis thesis investigates the perturbative dynamics and phenomenology of compact objects in two approaches to quantum gravity: quadratic gravity and asymptotic safety. Linear perturbations provide a…Andrea Spina·Oct 22, 2026SaveLearn
Testing charged Simpson-Visser-AdS spacetimes with twin-peak QPOsIn this manuscript, we study circular geodesics and twin-peak high-frequency quasi-periodic oscillations (HF-QPOs) in the charged Simpson--Visser--anti-de Sitter (AdS) spacetime, which depends on a…Saeed Ullah Khan, Javlon Rayimbaev, Muhammad Zahid et al.·Oct 22, 2026SaveLearn
Chaotic dynamics and resonances in Einstein-Rosen standing wave spacetimesRecent work has revealed chaotic geodesic behavior in Einstein-Rosen standing gravitational wave spacetimes. The dynamics of massive test particles are dominated by chaotic heteroclinic networks.…Adam A. Zychowicz·Oct 22, 2026SaveLearn
Stability, Tidal Deformability, and Statistical Constraints of Anisotropic Compact Stars with a Generalized Polytropic Equation of State : Modelling Observation with Buchdahl Space-TimeAn anisotropic compact star model is constructed within the framework of general relativity by combining the Buchdahl space-time with a generalized polytropic equation of state. The model parameters…Ritabrata Biswas, Arpan Bhattacharya, Subhajit Pal·Oct 22, 2026SaveLearn
Clarifications on black/white hole metastable relics as dark matterThe idea that the evaporation of black holes could end around the Planck mass and lead to relics possibly accounting for dark matter is quite old. In this article we focus on new models where the…Aurélien Barrau, Margaux Gajocha, Killian Martineau et al.·Oct 22, 2026SaveLearn
Gravitational waves from highly charged binary black holes in Einstein-Maxwell-dilaton theoryWe perform fully nonlinear numerical-relativity simulations of electrically charged binary black hole mergers in Einstein-Maxwell-dilaton (EMD) theory, varying the magnitude and relative sign of the…Ryoto Tomie, Kai Togashi, Kitaro Taniguchi et al.·Oct 22, 2026SaveLearn