scholarly journals Non-asymptotically flat, non-AdS dilaton black holes

2004 ◽  
Vol 70 (8) ◽  
Author(s):  
Gérard Clément ◽  
Cédric Leygnac
Keyword(s):  
Black Holes ◽  
Asymptotically Flat ◽  
Dilaton Black Holes

scholarly journals Asymptotically flat charged rotating dilaton black holes in higher dimensions

2008 ◽  
Vol 666 (1) ◽  
pp. 82-85 ◽  
Author(s):  
A. Sheykhi ◽  
M. Allahverdizadeh ◽  
Y. Bahrampour ◽  
M. Rahnama
Keyword(s):  
Black Holes ◽  
Higher Dimensions ◽  
Asymptotically Flat ◽  
Dilaton Black Holes

scholarly journals Islands and Page curves in charged dilaton black holes

2022 ◽  
Vol 82 (1) ◽  
Author(s):  
Ming-Hui Yu ◽  
Xian-Hui Ge
Keyword(s):  
Black Holes ◽  
Hawking Radiation ◽  
Entanglement Entropy ◽  
Von Neumann Entropy ◽  
Extremal Case ◽  
Von Neumann ◽  
Asymptotically Flat ◽  
Flat Spacetime ◽  
The Impact ◽  
Dilaton Black Holes

AbstractWe study the Page curve for eternal Garfinkle–Horowitz–Strominger dilaton black holes in four dimensional asymptotically flat spacetime by using the island paradigm. The results demonstrate that without the island, the entanglement entropy of Hawking radiation is proportional to time and becomes divergent at late times. While taking account of the existence of the island outside the event horizon, the entanglement entropy stops growing at late times and eventually reaches a saturation value. This value is twice of the Bekenstein–Hawking entropy and consistent with the finiteness of the von Neumann entropy of eternal black holes. Moreover, we discuss the impact of the stringy coefficient n and charge Q on the Page time and the scrambling time respectively. For the non-extremal case, the influence of the coefficient n on them is small compared to the influence of the charge Q. However, for the extremal case, the Page time and the scrambling time become divergent or near vanishing. This implies the island paradigm needs further investigation.

scholarly journals THERMODYNAMICAL PROPERTIES OF TOPOLOGICAL BORN–INFELD-DILATON BLACK HOLES

2009 ◽  
Vol 18 (01) ◽  
pp. 25-42 ◽  
Author(s):  
AHMAD SHEYKHI
Keyword(s):  
Black Holes ◽  
Analytic Solution ◽  
Canonical Ensemble ◽  
Nonlinear Electrodynamics ◽  
Positive Zero ◽  
De Sitter ◽  
Asymptotically Flat ◽  
Negative Constant ◽  
Curvature Hypersurface ◽  
Dilaton Black Holes

We examine the (n + 1)-dimensional (n ≥ 3) action in which gravity is coupled to the Born–Infeld nonlinear electrodynamic and a dilaton field. We construct a new (n + 1)-dimensional analytic solution of this theory in the presence of Liouville-type dilaton potentials. These solutions, which describe charged topological dilaton black holes with nonlinear electrodynamics, have unusual asymptotics. They are neither asymptotically flat nor (anti)-de Sitter. The event horizons of these black holes can be an (n - 1)-dimensional positive, zero or negative constant curvature hypersurface. We also analyze the thermodynamics and stability of these solutions and disclose the effect of the dilaton and Born–Infeld fields on the thermal stability in the canonical ensemble.

scholarly journals Islands and stretched horizon

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Yoshinori Matsuo
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Hawking Radiation ◽  
Entanglement Entropy ◽  
Total System ◽  
Island Rule ◽  
Asymptotically Flat ◽  
Flat Spacetime ◽  
Ads Spacetime ◽  
Hole Geometry

Abstract Recently it was proposed that the entanglement entropy of the Hawking radiation contains the information of a region including the interior of the event horizon, which is called “island.” In studies of the entanglement entropy of the Hawking radiation, the total system in the black hole geometry is separated into the Hawking radiation and black hole. In this paper, we study the entanglement entropy of the black hole in the asymptotically flat Schwarzschild spacetime. Consistency with the island rule for the Hawking radiation implies that the information of the black hole is located in a different region than the island. We found an instability of the island in the calculation of the entanglement entropy of the region outside a surface near the horizon. This implies that the region contains all the information of the total system and the information of the black hole is localized on the surface. Thus the surface would be interpreted as the stretched horizon. This structure also resembles black holes in the AdS spacetime with an auxiliary flat spacetime, where the information of the black hole is localized at the interface between the AdS spacetime and the flat spacetime.

scholarly journals Observations of Hawking radiation: the Page curve and baby universes

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Donald Marolf ◽  
Henry Maxfield
Keyword(s):  
Black Holes ◽  
Quantum Systems ◽  
Late Time ◽  
Asymptotically Flat ◽  
Black Hole Information ◽  
Flat Spacetimes ◽  
The Cost ◽  
Baby Universes ◽  
Time Extrapolation ◽  
Asymptotic Observers

AbstractWe reformulate recent insights into black hole information in a manner emphasizing operationally-defined notions of entropy, Lorentz-signature descriptions, and asymptotically flat spacetimes. With the help of replica wormholes, we find that experiments of asymptotic observers are consistent with black holes as unitary quantum systems, with density of states given by the Bekenstein-Hawking formula. However, this comes at the cost of superselection sectors associated with the state of baby universes. Spacetimes studied by Polchinski and Strominger in 1994 provide a simple illustration of the associated concepts and techniques, and we argue them to be a natural late-time extrapolation of replica wormholes. The work aims to be self-contained and, in particular, to be accessible to readers who have not yet mastered earlier formulations of the ideas above.

scholarly journals Thermodynamically stable asymptotically flat hairy black holes with a dilaton potential

2019 ◽  
Vol 2019 (3) ◽  
Author(s):  
Dumitru Astefanesei ◽  
David Choque ◽  
Francisco Gómez ◽  
Raúl Rojas
Keyword(s):  
Black Holes ◽  
Asymptotically Flat ◽  
Hairy Black Holes

scholarly journals Asymptotically non-flat rotating dilaton black holes

2003 ◽  
Vol 20 (7) ◽  
pp. 1403-1410 ◽  
Author(s):  
Tanwi Ghosh ◽  
P Mitra
Keyword(s):  
Black Holes ◽  
Dilaton Black Holes
Sign in / Sign up

Export Citation Format

Share Document