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General Relativity and Quantum Cosmology papers

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A Neutron Star Hidden Inside a Black Hole
We investigate dark matter admixed neutron stars in which the neutron star coexists with an anisotropic dark matter halo described by the Einasto density profile, a model recently shown to produce…
Chen Tan, Yong-Qiang WangAug 6, 2026gr-qc
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Spinning Particle Dynamics and Observational Redshift around an Asymptotically Flat Symmergent Black Hole
We investigate timelike particle dynamics, collision energetics, and photon frequency shifts in the perturbative variable-scalar curvature branch of asymptotically flat symmergent gravity. The…
Beyhan Puliçe, Ali ÖvgünAug 6, 2026gr-qc
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Quasinormal Modes of Gauss--Bonnet Black Holes via the Spectral Method: Scalar, Vector, and Tensor Perturbations
We present a unified study of scalar, vector, and tensor quasinormal modes (QNMs) of Schwarzschild black holes corrected by a Gauss--Bonnet (GB) term in higher dimensions. Using a high-precision…
Davide Batic, Denys DutykhAug 6, 2026gr-qc
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Radial spectra and dynamical signatures of excited boson stars
We compute the lowest radial mode of spherically symmetric boson stars along equilibrium branches with a fixed number of radial nodes, considering both mini boson stars and quartically…
Chen-Hao Hao, Wen-Di Guo, Qin Tan et al.Aug 6, 2026gr-qc
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Coherent End-to-End Search for Generic Extreme-Mass-Ratio Inspirals
Extreme-mass-ratio inspirals (EMRIs) encode more than 105 strong-field orbital cycles and are key targets for space-borne gravitational-wave interferometers, yet coherent recovery of generic…
Xiaobo Zou, Xingyu Zhong, Wen-Biao Han et al.Aug 6, 2026gr-qc
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A Scale-Invariant Theory of the Universe
Modern physics has achieved extraordinary empirical success while retaining much of the absolute, unobservable structure introduced by Newton, largely without questioning its necessity. We…
Julian Barbour, Maria I. R. LourençoAug 6, 2026gr-qc
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A Novel Kerr-like Black Hole in a General Double Power Law Dark Matter Environment: Geometry, Spectroscopy, and Energy Extraction
We construct a novel Kerr-like black hole solution embedded in a general double power law dark matter environment by applying the Newman--Janis algorithm to a Schwarzschild-like seed geometry. This…
Supakchai Ponglertsakul, David SenjayaAug 6, 2026gr-qc
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Asymmetric Quantum Oppenheimer-Snyder Collapse
We study black hole formation resulting from the collapse of a homogeneous and isotropic dust ball within a framework built upon loop quantum cosmology. Using loop dynamics formulated for…
Michał Bobula, Tomasz PawłowskiAug 6, 2026gr-qc
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How Loud Must a Neutron-Star Merger Be to Reveal Its Equation of State?
The tidal response of neutron stars during binary inspiral encodes the equation of state (EOS) of dense matter in the gravitational-wave signal. Quantifying the signal-to-noise ratio (SNR) required…
Sk Md Adil ImamAug 6, 2026gr-qc
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Constructing the canonical harmonic coordinates of Kerr metric to the fourth post-Minkowskian order
In this paper we construct the canonical harmonic coordinates of the Kerr metric within the multipolar post-Minkowskian (MPM) formalism to the fourth post-Minkowskian (4PM) order. Based on the well…
Zizheng Xing, Xiaokai He, Zhoujian CaoAug 6, 2026gr-qc
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Kinematic Bounds on Charged Energy Extraction in the Purely Electric Branch of Euler--Heisenberg Type f(R,T) Black Holes
We derive and test kinematic upper bounds on charged energy extraction in the purely electric branch of a static f(R,T) black hole family sourced by an Euler--Heisenberg type nonlinear…
Anirudh Pradhan, K. Ghaderi, M. ZeyauddinAug 6, 2026gr-qc
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Charged Penrose Extraction in RN--AdS Black Holes with Dark Energy: Ergosphere Geometry and Rigorous Efficiency Bounds
We develop a quantitative framework for charge assisted Penrose extraction in Reissner--Nordström Anti-de Sitter black holes surrounded by a Kiselev type anisotropic dark energy sector. The…
Anirudh Pradhan, K. Ghaderi, M. ZeyauddinAug 6, 2026gr-qc
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A First-Order Gauge Approach to de Sitter General Relativity
We propose a first-order gauge formulation of de Sitter relativity in which the pseudo-radius l(x) is promoted to a spacetime field, locally breaking SO(4,1) to SO(3,1). Here, l(x) is a geometric…
P. SalgadoAug 6, 2026gr-qc
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Energy Flux as an Entanglement Current in Moving-Mirror Radiation
In this work, we investigate the quantum entanglement properties of analog Hawking radiation produced by a moving mirror. Using two detector modes defined through window functions on a quantum field,…
Yasusada Nambu, Riku YoshimotoAug 6, 2026gr-qc
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Unified dark sector and Hubble-tension alleviation in scalar-vector-tensor gravity
We investigate a scalar-vector-tensor theory in which matter is minimally coupled to a Jordan-frame metric gμν=(1+Ξ)gμν, while a massive vector sector interacts with the baryonic…
Kimet Jusufi, Amir A. Khodahami, Ahmad Sheykhi et al.Aug 6, 2026gr-qc
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Classical General Relativity as a Non-Conservative Action-Dependent Field Theory
Previous work has provided the mathematical framework within which to analyse dynamical similarities for classical theories of fields. This formalism has been extended to those theories which, in…
Callum Bell, David SloanAug 6, 2026gr-qc
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Magnetic reconnection in five-dimensional Kerr black hole
In this paper, we employ the Comisso-Asenjo magnetic reconnection (MR) mechanism to investigate energy extraction from a rapidly rotating five-dimensional Kerr black hole (BH) with single- and…
Ikhtiyor Eshtursunov, Sanjar Shaymatov, Chengxun YuanAug 6, 2026gr-qc
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Boltzmann equation in the 212-post-Newtonian approximation
Within the framework of the post-Newtonian 212 approximation theory, a kinetic theory for relativistic gases in the presence of gravitational fields is developed. The Boltzmann equation and…
Gilberto M. KremerAug 6, 2026gr-qc
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Relativistic frequency shifts in gravitational waves from axion clouds
Superradiant instability of ultralight bosons can produce clouds around rotating black holes, whose continuous gravitational wave (GW) emission is a promising observational target. Precise…
Takuya TakahashiAug 6, 2026gr-qc
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First Law for Nonsingular Black Holes in 2D Dilaton Gravity
A central issue in the thermodynamics of nonsingular black holes is the apparent violation of the first law. In this work, we use 2D dilaton gravity as a simple theoretical setting to study this…
Peng Yu, Yuan ZhongAug 6, 2026gr-qc
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A loop quantization of the marginally bound Lemaître-Tolman-Bondi dust model
We present a loop quantization of the marginally bound Lemaître-Tolman-Bondi (LTB) model, describing the gravitational collapse of pressureless dust in spherical symmetry. The full quantum LTB model…
Luca Cafaro, Farshid SoltaniAug 6, 2026gr-qc
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Growth factor in teleparallel Gauss-Bonnet gravity
Teleparallel gravity offers a competing geometric framework on which to build cosmological models. The Gauss-Bonnet invariant captures key aspects of the underlying geometry that has been shown to be…
Shivam Kumar Mishra, Jackson Levi Said, B. MishraAug 6, 2026gr-qc
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Effective ΛCDM model emerging from f(Q,T) under a special EOS limit in symmetric cosmology with Bayesian and ANN observational constraints
In this work, we investigate the cosmological consequences of an effective ΛCDM model emerging from the more general f(Q,T) gravity theory under the special equation-of-state condition $ρ+ p =…
Anil Kumar Yadav, S. H. Shekh, N. Myrzakulov et al.Aug 6, 2026gr-qc
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Universal supercritical thermodynamics for black holes
We investigate thermodynamic crossovers for black holes in the supercritical regime beyond the critical point, where small and large black holes become indistinguishable from the conventional…
Shoucheng Wang, Xinyang Li, Yuliang Jin et al.Aug 6, 2026gr-qc
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Extended Scalar Particle Solutions in Black String Spacetimes with Anisotropic Quintessence
We present novel solutions to the Klein-Gordon equation in a black string spacetime immersed in an anisotropic quintessence fluid and surrounded by a cloud of strings (BCK spacetime). The solutions…
M. L. Deglmann, B. V. Simão, C. C. BarrosAug 6, 2026gr-qc
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