scholarly journals Conformal vacuum and the fluctuation-dissipation theorem in a de Sitter universe and black hole spacetimes

2019 ◽  
Vol 100 (8) ◽  
Author(s):  
Ashmita Das ◽  
Surojit Dalui ◽  
Chandramouli Chowdhury ◽  
Bibhas Ranjan Majhi
Keyword(s):  
Black Hole ◽  
De Sitter ◽  
Black Hole Spacetimes ◽  
Fluctuation Dissipation ◽  
Fluctuation Dissipation Theorem ◽  
Sitter Universe ◽  
De Sitter Universe

scholarly journals REGULAR BLACK HOLES IN AN ASYMPTOTICALLY DE SITTER UNIVERSE

2008 ◽  
Vol 23 (40) ◽  
pp. 3377-3392 ◽  
Author(s):  
JERZY MATYJASEK ◽  
DARIUSZ TRYNIECKI ◽  
MARIUSZ KLIMEK
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Nonlinear Electrodynamics ◽  
Spherically Symmetric ◽  
De Sitter ◽  
Coupled Equations ◽  
Sitter Universe ◽  
De Sitter Universe ◽  
Horizon Geometry ◽  
Interesting Solution

A regular solution of the system of coupled equations of the nonlinear electrodynamics and gravity describing static and spherically-symmetric black holes in an asymptotically de Sitter universe is constructed and analyzed. Special emphasis is put on the degenerate configurations (when at least two horizons coincide) and their near horizon geometry. It is explicitly demonstrated that approximating the metric potentials in the region between the horizons by simple functions and making use of a limiting procedure one obtains the solutions constructed from maximally symmetric subspaces with different absolute values of radii. Topologically they are AdS2×S2 for the cold black hole, dS2×S2 when the event and cosmological horizon coincide, and the Plebański–Hacyan solution for the ultraextremal black hole. A physically interesting solution describing the lukewarm black holes is briefly analyzed.

Quantum state for a black hole in a de Sitter universe

1985 ◽  
Vol 44 (6) ◽  
pp. 423-428 ◽  
Author(s):  
R. Balbinot ◽  
R. Bergamini
Keyword(s):  
Black Hole ◽  
Quantum State ◽  
De Sitter ◽  
Sitter Universe ◽  
De Sitter Universe

scholarly journals Asymptotically de Sitter universe inside a Schwarzschild black hole

2020 ◽  
Vol 102 (6) ◽  
Author(s):  
Emanuele Alesci ◽  
Sina Bahrami ◽  
Daniele Pranzetti
Keyword(s):  
Black Hole ◽  
De Sitter ◽  
Schwarzschild Black Hole ◽  
Sitter Universe ◽  
De Sitter Universe
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