scholarly journals Quasinormal modes and strong cosmic censorship in near-extremal Kerr–Newman–de Sitter black-hole spacetimes

2018 ◽  
Vol 780 ◽  
pp. 221-226 ◽  
Author(s):  
Shahar Hod
Keyword(s):  
Black Hole ◽  
Quasinormal Modes ◽  
Cosmic Censorship ◽  
De Sitter ◽  
Black Hole Spacetimes ◽  
Strong Cosmic Censorship

scholarly journals A proof of the strong cosmic censorship conjecture

2020 ◽  
Vol 29 (14) ◽  
pp. 2042003
Author(s):  
Shahar Hod
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Second Law Of Thermodynamics ◽  
Cosmic Censorship ◽  
Necessary Condition ◽  
Deterministic Theory ◽  
Black Hole Spacetimes ◽  
Generalized Second Law ◽  
Strong Cosmic Censorship ◽  
Cosmic Censorship Conjecture

The Penrose strong cosmic censorship conjecture asserts that Cauchy horizons inside dynamically formed black holes are unstable to remnant matter fields that fall into the black holes. The physical importance of this conjecture stems from the fact that it provides a necessary condition for general relativity to be a truly deterministic theory of gravity. Determining the fate of the Penrose conjecture in nonasymptotically flat black hole spacetimes has been the focus of intense research efforts in recent years. In this paper, we provide a remarkably compact proof, which is based on Bekenstein’s generalized second law of thermodynamics, for the validity of the intriguing Penrose conjecture in physically realistic (dynamically formed) curved black hole spacetimes.

scholarly journals Strong cosmic censorship in charged black-hole spacetimes: Still subtle

2018 ◽  
Vol 98 (10) ◽  
Author(s):  
Vitor Cardoso ◽  
João L. Costa ◽  
Kyriakos Destounis ◽  
Peter Hintz ◽  
Aron Jansen
Keyword(s):  
Black Hole ◽  
Cosmic Censorship ◽  
Charged Black Hole ◽  
Black Hole Spacetimes ◽  
Strong Cosmic Censorship

scholarly journals Strong cosmic censorship in near-extremal Kerr-Sen-de Sitter spacetime

2021 ◽  
Vol 81 (11) ◽  
Author(s):  
Ming Zhang ◽  
Jie Jiang
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Equations Of Motion ◽  
Cosmic Censorship ◽  
Cauchy Horizon ◽  
De Sitter ◽  
Sitter Spacetime ◽  
Resonant Modes ◽  
Strong Cosmic Censorship ◽  
Black Hole Spacetime

AbstractIn this work, we first calculate equations of motion for particles in the Kerr-Sen-de Sitter black hole spacetime. Then, in the eikonal regime, we analytically obtain the quasi-normal resonant modes of massless neutral scalar field perturbation and find its imaginary part to be characterized by the surface gravity of a near-extremal Kerr-Sen-de Sitter black hole with the Cauchy horizon approaching the event horizon. We further show that the Penrose strong cosmic censorship conjecture is thus respected in this spacetime with dilaton scalar field and axion pseudoscalar field.

scholarly journals Strong cosmic censorship in charged de sitter spacetime with scalar field non-minimally coupled to curvature

2019 ◽  
Vol 79 (11) ◽  
Author(s):  
Hong Guo ◽  
Hang Liu ◽  
Xiao-Mei Kuang ◽  
Bin Wang
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Cosmological Constant ◽  
Coupling Parameter ◽  
Cosmic Censorship ◽  
Charge Ratio ◽  
Cauchy Horizon ◽  
De Sitter ◽  
Critical Charge ◽  
Strong Cosmic Censorship

Abstract We examine the strong cosmic censorship in the Reissner–Nordstrom–de Sitter (RN-dS) black hole by investigating the evolution of a scalar field non-minimally coupled to the curvature. We find that for the stable RN-dS black hole, with the increase of the coupling parameter, the violation of the strong cosmic censorship occurs at a larger critical charge ratio. But such an increase of the critical charge is suppressed by the increase of the cosmological constant. Different from the minimal coupling situation, it is possible to accommodate $$\beta \ge 1$$β≥1 in the near extremal black hole when the scalar field is non-minimally coupled to curvature. $$\beta $$β here is defined as $$\beta \equiv -\frac{\mathrm {Im}\;\omega }{\kappa _{-}}$$β≡-Imωκ- where $$\kappa _{-}$$κ- is the surface gravity of Cauchy horizon and $$\omega $$ω is the frequency of quasinormal modes. The increase of the cosmological constant can allow $$\beta \ge 1$$β≥1 to be satisfied for even smaller value of the coupling parameter. The existence of $$\beta \ge 1$$β≥1 implies that the resulting curvature can continuously cross the Cauchy horizon.

scholarly journals Strong cosmic censorship for a scalar field in a Born-Infeld–de Sitter black hole

2019 ◽  
Vol 100 (12) ◽  
Author(s):  
Qingyu Gan ◽  
Guangzhou Guo ◽  
Peng Wang ◽  
Houwen Wu
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Cosmic Censorship ◽  
De Sitter ◽  
Strong Cosmic Censorship
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