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General Relativity and Quantum Cosmology papers — page 66

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Field theory vacuum and entropic dark energy models
While in the standard quantization the energy spectrum of oscillator does not depend on its mass - for Planck length deformed quantization the energy spectrum becomes mass dependent. That means that…
Michael MaziashviliJul 6, 2026
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Universal Leading Quantum Stress Near the Schwarzschild Singularity
Determining the local quantum source near a spacelike singularity is essential for assessing semiclassical backreaction inside black holes. By standard point splitting, we provide, to our knowledge,…
Shun Jiang, Jie JiangJul 5, 2026
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Rigidity and the interpretation of mass with a positive cosmological constant
We provide an explicit counterexample to the rigidity properties underlying the interpretation of mass in the presence of a positive cosmological constant Λ. Specifically, we construct a family of…
Eneko Aranguren, Raül VeraJul 5, 2026
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Tests of general relativity using analytic derivatives of parametrized post-Einsteinian gravitational waveforms within the Fisher-matrix framework
Testing gravity beyond general relativity (GR) is essential for probing fundamental physics in the strong-field and highly dynamical regime accessed by gravitational-wave (GW) observations. In this…
Jie Wu, Mengfei Sun, Jin LiJul 5, 2026
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Where Thermodynamics Meets Geometry: Critical-Radius Coincidences in Confining-NED Black Holes with Barrow Entropy
We study a static, spherically symmetric black hole obtained from Einstein gravity coupled to a nonlinear electrodynamics model with a quark--antiquark confinement interaction. The metric extends…
Erdem Sucu, İzzet SakallıJul 5, 2026
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Smooth Signature Change as a Mechanism for Singularity Avoidance in BTZ Black Holes
Spacetime singularities represent a fundamental challenge in classical general relativity, prompting investigations into mechanisms that could resolve or avoid them. The paradigm of signature…
Farzad MilaniJul 5, 2026
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ACT-DR6 consistent inflation in generalised entropic cosmology and f(Q) gravity
Within the framework of generalised entropic cosmology and its equivalent f(Q) gravity, we construct inflationary scenarios consistent with recent Atacama Cosmology Telescope (ACT) observations…
Shin'ichi Nojiri, Sergei D. OdintsovJul 4, 2026
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Transient Dynamical Wormholes with Decaying Radial Energy Flux
We investigate a class of time-dependent traversable wormholes within the framework of general relativity by allowing the shape function to vary with time. In this setting, the evolution of the…
Allah Ditta, Phongpichit ChannuieJul 4, 2026
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On the structure of black hole interior in a model of scalar quasi-particles within the GR framework
We propose an effective, singularity-free model of the black hole interior described entirely by a scalar field with a non-linear self-interaction potential. The interior consists of three layers --…
S. BondarenkoJul 4, 2026
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Semiclassical regularity of compact trapped regions: From dynamical horizons to inner extremality
In eternal black-hole spacetimes, inner horizons are Cauchy horizons and are generically unstable. For non-extremal inner horizons, this includes both the classical mass-inflation instability and a…
Raúl Carballo-Rubio, Francesco Di Filippo, Stefano Liberati et al.Jul 4, 2026
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Identifying lensed gravitational waves with physics-informed posterior learning
Gravitational lensing of gravitational waves can probe compact lenses, dark matter substructure, and cosmological distances, but identifying lensed events is difficult when unrelated binary mergers…
Tian-Yang Sun, Xiao Guo, Jing-Fei Zhang et al.Jul 4, 2026
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Radiated Energy Spectrum, Radiated Angular Distribution and Non-linear Memory from the One-loop Gravitational Bremsstrahlung Waveform
The frequency-domain gravitational waveform emitted by the scattering of two non-spinning massive particles has recently been derived at next-to-leading, i.e. one-loop, post-Minkowskian…
Donato Bini, Thibault Damour, Stefano De Angelis et al.Jul 4, 2026
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Equatorial periodic orbits and gravitational waveforms in Bardeen black holes surrounded by perfect fluid dark matter
To probe the interplay between dark matter (DM) and non-linear electrodynamics (NED), we consider the Bardeen black hole (BH) surrounded by perfect fluid dark matter (PFDM). We first compute the…
Sohan Kumar JhaJul 4, 2026
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Additional Observational Signatures of Asymmetric Thin-Shell Wormholes within 4D Einstein-Gauss-Bonnet Gravity
In this paper, we study the optical appearance of a 4D Einstein-Gauss-Bonnet asymmetric thin-shell wormhole. Using Visser's cut-and-paste construction, we determine the photon sphere radius and…
J. Song, X. G. LanJul 4, 2026
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Dynamical tidal response of neutron stars via scattering amplitudes
A key challenge of gravitational-wave physics is distinguishing the nature of compact objects in binary coalescences, in particular whether they are black holes or neutron stars. Neutron stars are…
M. V. S. Saketh, Suprovo Ghosh, Nils AnderssonJul 4, 2026
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Thermodynamics of dynamical black holes beyond perturbation theory
The close similarities of the three laws of black hole mechanics, discovered by Bardeen, Carter and Hawking, with the laws of thermodynamics led to the identification of a multiple of the area of the…
Abhay Ashtekar, Daniel E. Paraizo, Jonathan ShuJul 4, 2026
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Breathing Black Hole Shadows in Modified Gravity (MOG)
In this paper, we investigate the dynamic phenomenological signatures of a Schwarzschild-MOG black hole shadow perturbed by passing gravitational waves. By perturbing the Hamilton-Jacobi equation for…
Nikko John Leo S. Lobos, Emmanuel T. RodulfoJul 4, 2026
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Exponential f(R) cosmology with massive neutrinos as a dynamical dark energy framework
The exponential f(R) gravity model provides a theoretically well-motivated extension of General Relativity, introducing a modified gravitational dynamics at late times consistent with a dynamical…
Simone D'Onofrio, Sergei Odintsov, Tiziano SchiavoneJul 4, 2026
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The effective speed of sound in cosmological perturbation theory
In a multi-field/fluid cosmological system consisting of minimally coupled canonical scalar fields, non-canonical scalar fields, and barotropic perfect fluids, we introduce a new definition for the…
Sanil UnnikrishnanJul 4, 2026
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Generalized Unruh temperature for dynamical thin-shell wormholes
We unify two independent notions of effective temperature in dynamical thin-shell wormholes: the local acceleration temperature of the throat and the Hawking-like particle-creation temperature…
Francisco S. N. Lobo, Manuel E. RodriguesJul 3, 2026
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Black Hole Memory Burden and its Signatures in Gravitational Waves from Mergers
Swift memory burden (MB) implies that the information stored in a black hole (BH) can modify its classical dynamics when the BH is perturbed. This influences the gravitational waves (GWs) emitted…
Gia Dvali, Michael Zantedeschi, Sebastian ZellJul 3, 2026
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Dark energy genesis: modeling dissipative effects in primordial cosmology
In various approaches to quantum gravity, spacetime geometry is understood to emerge from more fundamental discrete structures at the Planck scale. As sometimes posited, their presence could lead to…
Pietro Pellecchia, Alejandro Perez, Salvatore RibisiJul 3, 2026
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Conformal symmetries and MOTS stability
Let \Σt\ be a spacelike foliation of a spacetime M, and suppose each Σt is foliated by 2-surfaces S with spacelike unit normal in Σt. We show that under mild energy…
Abbas M. SherifJul 3, 2026
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Black holes in f(R) theory of gravity with compact extra dimensions
We study static, spherically symmetric solutions in f(R) gravity within a D = 4+n-dimensional spacetime, where the extra dimensions form a compact n-sphere of constant radius. We derive an…
Arkady Popov, Sergey RubinJul 3, 2026
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Decoherence Effects on Primordial Black Holes and Scalar-Induced Gravitational Waves
Primordial black holes (PBHs) form when large primordial curvature perturbations re-enter the Hubble radius and exceed the classical collapse threshold. These perturbations originate as quantum…
Waqas AhmedJul 3, 2026
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