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

ENERGY LOCALIZATION FOR DILATONIC BLACK HOLE GEOMETRIES WITH A PURE MONOPOLE FIELD

2010 ◽  
Vol 19 (08n10) ◽  
pp. 1253-1258
Author(s):  
I. RADINSCHI ◽  
T. GRAMMENOS
Keyword(s):  
Black Holes ◽  
Dimensional Space ◽  
Spherically Symmetric ◽  
Dilaton Field ◽  
Energy Localization ◽  
Asymptotically Flat ◽  
Adm Mass ◽  
Hairy Black Holes ◽  
Momentum Complex ◽  
Dilatonic Black Hole

The energy distribution of black holes with a dilaton and a pure monopole field is calculated by using Møller's energy–momentum complex. The four-dimensional space–times considered are static, spherically symmetric and asymptotically flat, exact solutions stemming from an action that besides gravity contains a dilaton field and a pure monopole field. The resulting "hairy" black holes have an essential singularity at the origin and two horizons. The energy obtained depends on the value of the dilaton field, the monopole charge and the ADM mass. All the momenta vanish for the space–time geometries considered.

scholarly journals Asymptotically flat hairy black holes in massive bigravity

2020 ◽  
Vol 102 (12) ◽  
Author(s):  
Romain Gervalle ◽  
Mikhail S. Volkov
Keyword(s):  
Black Holes ◽  
Asymptotically Flat ◽  
Hairy Black Holes

scholarly journals Exact asymptotically flat charged hairy black holes with a dilaton potential

2013 ◽  
Vol 2013 (10) ◽  
Author(s):  
Andrés Anabalón ◽  
Dumitru Astefanesei ◽  
Robert Mann
Keyword(s):  
Black Holes ◽  
Asymptotically Flat ◽  
Hairy Black Holes

scholarly journals Thermodynamically stable asymptotically flat hairy black holes with a dilaton potential: the general case

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Dumitru Astefanesei ◽  
Jose Luis Blázquez-Salcedo ◽  
Francisco Gómez ◽  
Raúl Rojas
Keyword(s):  
Black Holes ◽  
Thermodynamic Stability ◽  
General Class ◽  
Spherically Symmetric ◽  
Spatial Infinity ◽  
Asymptotically Flat ◽  
Equilibrium Configurations ◽  
Hairy Black Holes ◽  
Extremal Limit ◽  
Stable Solutions

Abstract We extend the analysis, initiated in [1], of the thermodynamic stability of four-dimensional asymptotically flat hairy black holes by considering a general class of exact solutions in Einstein-Maxwell-dilaton theory with a non-trivial dilaton potential. We find that, regardless of the values of the parameters of the theory, there always exists a sub-class of hairy black holes that are thermodynamically stable and have the extremal limit well defined. This generic feature that makes the equilibrium configurations locally stable should be related to the properties of the dilaton potential that is decaying towards the spatial infinity, but behaves as a box close to the horizon. We prove that these thermodynamically stable solutions are also dynamically stable under spherically symmetric perturbations.

scholarly journals Hairy black holes in disformal scalar-tensor gravity theories

2021 ◽  
Vol 104 (2) ◽  
Author(s):  
Cristian Erices ◽  
Pantelis Filis ◽  
Eleftherios Papantonopoulos
Keyword(s):  
Black Holes ◽  
Hairy Black Holes ◽  
Gravity Theories

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 New non-extremal and BPS hairy black holes in gauged $$ \mathcal{N} $$ = 2 and $$ \mathcal{N} $$ = 8 supergravity

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Andres Anabalon ◽  
Dumitru Astefanesei ◽  
Antonio Gallerati ◽  
Mario Trigiante
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Boundary Conditions ◽  
Charged Black Hole ◽  
Dual Theory ◽  
Real Numbers ◽  
Hairy Black Holes ◽  
Interpolation Parameter ◽  
Black Hole Solutions ◽  
Extremal Black Holes

Abstract In this article we study a family of four-dimensional, $$ \mathcal{N} $$ N = 2 supergravity theories that interpolates between all the single dilaton truncations of the SO(8) gauged $$ \mathcal{N} $$ N = 8 supergravity. In this infinitely many theories characterized by two real numbers — the interpolation parameter and the dyonic “angle” of the gauging — we construct non-extremal electrically or magnetically charged black hole solutions and their supersymmetric limits. All the supersymmetric black holes have non-singular horizons with spherical, hyperbolic or planar topology. Some of these supersymmetric and non-extremal black holes are new examples in the $$ \mathcal{N} $$ N = 8 theory that do not belong to the STU model. We compute the asymptotic charges, thermodynamics and boundary conditions of these black holes and show that all of them, except one, introduce a triple trace deformation in the dual theory.

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.

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