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General Relativity and Quantum Cosmology papers — page 83

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Integrability of R2 gravity cosmological models with radiation
We consider cosmological R2 gravity models with radiation. We find the general solution to the trace equation R=0 in the spatially flat Friedmann-Lemaitre-Robertson-Walker (FLRW) metric. We…
Vsevolod R. Ivanov, Sergey Yu. VernovJun 16, 2026
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Lagrangian Extensions of Newtonian Gravity constrained by Solar System tests
We explore an extension to Newtonian gravity through a generalised Lagrangian function with the introduction of a second dynamical scalar field. Building on previous research into gravity with…
Pedro H. Dalprá, Júlio C. Fabris, Hermano Velten et al.Jun 16, 2026
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Adaptive ray tracing, image diagnostics, and photon ring signatures of rotating dark-matter-dressed black holes
We study the optical appearance of rotating black holes embedded in dark matter environments using a phenomenological ray tracing framework. Rather than focusing on a single geometry, we compare two…
Mohsen FathiJun 16, 2026
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Energy conditions in static, spherically symmetric spacetimes and effective geometries
Classical energy conditions are investigated in generic static and spherically symmetric spacetimes. In setups with nonconstant gtt grr, the appearance of horizons can signal the violation of…
Zi-Liang Wang, Emmanuele BattistaJun 16, 2026
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Thermodynamic constraints and future singularities in Unimodular Gravity driven by phantom and non-phantom fluids
This work investigates future cosmological singularities in a flat FLRW universe filled with a single barotropic fluid, (p = (γ- 1)ρ), within the framework of unimodular gravity. In this setting,…
Norman Cruz, Samuel Lepe, Guillermo Palma et al.Jun 16, 2026
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Geometric properties of slowly rotating black holes embedded in matter environments
Extreme mass-ratio inspirals (EMRIs) provide a precise probe of strong-field gravity, where small deviations from vacuum Kerr geometry can accumulate over many orbital cycles. In realistic…
Sayak Datta, Chiranjeeb SinghaJun 16, 2026
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Null Raychaudhuri Equation and the Impossibility of Traversable Wormholes in Unimodular Gravity
We formulate the traversability of wormhole throats as a local and covariant null defocusing condition derived from the Raychaudhuri equation. Since unimodular gravity preserves the local geometric…
Erick Pastén, Marco Bosquez, Norman CruzJun 16, 2026
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Matter environments around black holes: geodesics, light rings, and ultracompact configurations
Astrophysical black holes are invariably embedded in matter environments whose gravitational influence can alter key strong-field features of the spacetime. In this work, we investigate the impact of…
Dylan S. Fonseca, Caio F. B. Macedo, Mateus Malato Corrêa et al.Jun 16, 2026
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Internal structure of Hayward black holes
Regular black holes, free of central singularities, provide an ideal laboratory for probing the geometric structure of spacetime. The global structure of some regular black holes, e.g. Hayward black…
Caiying Shao, Jun-Qi Guo, Yu Tian et al.Jun 16, 2026
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Dynamical Formation of Black Holes due to Boundary Effect in Vacuum Gravity
We prove the dynamical formation of a marginally outer trapped surface in pure vacuum spacetime from smooth asymptotically flat Cauchy data which initially contain no MOTS. The mechanism is a…
Puskar Mondal, Shing-Tung YauJun 16, 2026
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Dynamical Tidal Response of Schwarzschild Black Holes
Dynamical Love numbers capture the conservative response of an object to a time-dependent external tidal gravitational field. We compute the dynamical Love numbers of Schwarzschild black holes in…
Oscar Combaluzier--Szteinsznaider, Daniel Glazer, Austin Joyce et al.Jun 16, 2026
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Null integrability and photon phenomenology in the accelerated Schwarzschild black hole
Uniformly accelerated black holes provide a controlled setting to isolate how translatory acceleration and conical defects modify photon dynamics and observable optics. We analyse null geodesics in…
Shokoufe Faraji, Eva HackmannJun 16, 2026
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Sequential simulation-based inference for extreme mass ratio inspirals
Extreme mass-ratio inspirals pose a difficult challenge in terms of both search and parameter estimation for upcoming space-based gravitational-wave detectors such as LISA. Their signals are long and…
Philippa S. Cole, James Alvey, Lorenzo Speri et al.Jun 16, 2026
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Relativistic magnetohydrodynamics in the early Universe
We review the conservation laws of magnetohydrodynamics (MHD) in an expanding homogeneous and isotropic Universe that can be applied to the study of early Universe physics during the epoch of…
Alberto Roper Pol, Antonino Salvino MidiriJun 16, 2026
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Shadow, Emission, and Strong-Field Lensing of Dilatonic Black Holes
We study the shadow and strong-field optical properties of a static, spherically symmetric dyon-like dilatonic black hole. The photon sphere radius, critical impact parameter, and shadow radius are…
Kuantay Boshkayev, Ainur Urazalina, Aidana Kurmanbek et al.Jun 15, 2026
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CASPER: Interpretable ResNet based Classifier with FastShap Explainer for Gravitational Wave Detection
Traditional matched filtering has been the standard for Gravitational waves (GW) detection ever since LIGO was established, even though it requires pre-computed waveform templates and provides no…
R. Rai, R. Verma, SomyaJun 15, 2026
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Exciting the Vacuum: Non-Thermal Particle Bursts and Multi-Messenger Signals from Binary Black Holes
We investigate particle production in the dynamical curved spacetime of a binary black hole system. Particle production is a well-known feature of quantum field theory in curved spacetime, underlying…
Sohrab RahvarJun 15, 2026
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Boundary conditions and Hilbert spaces in no-roll quantum cosmology
We construct Hilbert spaces for the minisuperspace quantum cosmology of a closed Universe in the limit of extreme slow-roll inflation, in which the scalar field is approximated as constant. In this…
Steffen GielenJun 15, 2026
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Improving low-latency multi-messenger follow-up of neutron star-black hole mergers with mode-by-mode filtering
Rapid parameter estimation for neutron star-black hole (NSBH) mergers is essential for deciding whether, where, and how electromagnetic facilities should follow up gravitational-wave alerts. Current…
Francesco Iacovelli, Digvijay Wadekar, Javier Roulet et al.Jun 15, 2026
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Quantum fate of the Choptuik naked singularity
Classical critical collapse provides a dynamical route from smooth initial data to a naked singularity, representing a sharper violation of predictability than ordinary black hole singularities. We…
Chih-Hung WuJun 15, 2026
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Fixed-quadrupole static tidal response of Schwarzschild black holes in a cubic Weyl effective field theory
Static Love numbers of four-dimensional Schwarzschild black holes vanish in general relativity. We study how the fixed-quadrupole static tidal solution is modified by the parity-even cubic Weyl…
Edilberto O. SilvaJun 15, 2026
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Non-linear stability of the matter dominated universe
We numerically study non-linear perturbations of the Einstein-de Sitter spacetime as a solution to the Gowdy-symmetric Einstein-Euler system for a polytropic equation of state. The results suggest…
David Fajman, Elliot MarshallJun 15, 2026
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Kinetic Theory of Cosmological Magnetogenesis at Second Order: A New Density-Gradient Source and Comparison with the Harrison Mechanism
We derive and compare three mechanisms of cosmological magnetogenesis: the Thomson-scattering velocity-difference mechanism of Takahashi et al.\ (2005), a new density-gradient source identified here…
Bob OsanoJun 15, 2026
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Generalized Unimodular Gravity and Cosmological Perturbations
The generalized unimodular theory is revisited and its consequence for cosmology is discussed. The usual matter components of the universe are obtained in a pure geometric way. This result gives a…
Júlio C. Fabris, Alexander Yu. KamenshchikJun 15, 2026
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Ultraviolet Structure of Real-time Gravitational Wave Linear Response in a Resonant Scalar Field
We study the real-time linear response of gravitational waves in a time-dependent resonant scalar field in a Minkowski background. In the Schwinger-Keldysh formalism, we develop an adiabatic…
Han Lai, Atsuhisa OtaJun 15, 2026
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