Results 71 to 80 of about 51,175 (198)

Shadows and photon rings of a quantum black hole

Physics Letters B
Recently, a black hole model in loop quantum gravity has been proposed by Lewandowski, Ma, Yang and Zhang (2023) [34]. The metric tensor of the quantum black hole (QBH) is a suitably modified Schwarzschild one.
Jing-Peng Ye, Zhi-Qing He, Ai-Xu Zhou, Zi-Yang Huang, Jia-Hui Huang   +4 more
doaj   +1 more source

The formation of black holes in spherically symmetric gravitational collapse

, 2007
We consider the spherically symmetric, asymptotically flat Einstein-Vlasov system. We find explicit conditions on the initial data, with ADM mass M, such that the resulting spacetime has the following properties: there is a family of radially outgoing ...
A.D. Rendall, A.D. Rendall, D. Christodoulou, D. Christodoulou, D. Christodoulou, D. Christodoulou, D. Christodoulou, E. Poisson, G. Rein, G. Rein, G. Rein, Gerhard Rein, H. Andréasson, H. Andréasson, H. Andréasson, H. Andréasson, Håkan Andréasson, J. Binney, J.R. Oppenheimer, M. Dafermos, M. Dafermos, Markus Kunze, R. Penrose, S. Hawking   +23 more
core   +2 more sources

Quantum GraviElectro Dynamics

Annalen der Physik, Volume 538, Issue 1, January 2026.
The BRST invariant Lagrangian of the gravitationally interacting U(1)$U(1)$ gauge theory, namely the Quantum GraviElectro Dynamics (QGED). The Yan–Mills theory with the Hilbert–Einstein gravitational Lagrangian, namely the Yang–Mills–Utiyama (YMU) theory, is defined and quantised using the standard procedure. The theory is perturbatively renormalisable,
Yoshimasa Kurihara
wiley   +1 more source

The Lyra–Schwarzschild Spacetime

Universe
In this paper, we provide a complete analysis of the most general spherical solution of the Lyra scalar-tensor (LyST) gravitational theory based on the proper definition of a Lyra manifold.
M. C. Bertin, R. R. Cuzinatto, J. A. Paquiyauri, B. M. Pimentel   +3 more
doaj   +1 more source

Nonlocal Black Hole Evaporation and Quantum Metric Fluctuations via Inhomogeneous Vacuum Density

Advances in High Energy Physics, 2018
Inhomogeneity of the actual value of the vacuum energy density is considered in a black hole background. We examine the back-reaction of a Schwarzschild black hole to the highly inhomogeneous vacuum density and argue the fluctuations lead to deviations ...
Alexander Y. Yosifov, Lachezar G. Filipov   +1 more
doaj   +1 more source

Replica Wormholes and Quantum Hair

Fortschritte der Physik, Volume 74, Issue 1, January 2026.
Abstract The recent applications of Euclidean path integrals to the black hole information problem are discussed. In calculations with replica wormholes as the next‐to‐leading order correction to the Gibbons–Hawking saddlepoint, the radiation density matrix approaches a pure state at late times, following the Page curve.
Xavier Calmet, Stephen D. H. Hsu
wiley   +1 more source

Grey‐Body Factors and Absorption Cross‐Sections of Scalar and Dirac Fields in the Vicinity of Dilaton‐De Sitter Black Hole

Fortschritte der Physik, Volume 74, Issue 1, January 2026.
Abstract The propagation of a massive scalar field and a massless Dirac field in the geometry of a dilaton–de Sitter black hole is investigated. Starting from the covariant perturbation equations, the corresponding effective potentials are presented and their dependence on the dilaton charge, field mass, and cosmological constant is analyzed. Using the
Bekir Can Lütfüoğlu
wiley   +1 more source

On the Electromagnetic Energy Flow Along Geodesics

Radio Science, Volume 61, Issue 1, January 2026.
Abstract We present a field‐theoretic framework for modeling electromagnetic energy propagation in heterogeneous media by introducing the concept of electromagnetic geodesics. Unlike traditional ray optics, which assumes either a straight‐line propagation or a simple bending in refractive media, our approach formulates wave propagation as geodetic ...
Jacob T. Fokkema, Peter M. van den Berg
wiley   +1 more source

Instability analysis of massive static phantom wormholes via the spectral method

European Physical Journal C: Particles and Fields
Using the spectral method, we investigate the scalar and axial quasinormal modes (QNMs) of massive static phantom wormholes. Our results reveal the existence of purely imaginary QNMs that were not identified in previous studies, suggesting potential (in ...
Davide Batic, Denys Dutykh
doaj   +1 more source

Euclidean Path Integral, D0-Branes and Schwarzschild Black Holes in Matrix Theory

, 1998
The partition function in Matrix theory is constructed by Euclidean path integral method. The D0-branes, which move around in the finite region with a typical size of Schwarzschild radius, are chosen as the background.
Banks, Chepelev, de Alwis, Douglas, Ganor, Gibbons, Jian-Ge Zhou, Kabat, Lifschytz, Nobuyoshi Ohta, Taylor   +10 more
core   +1 more source