Spherically symmetric, static black holes with scalar hair, and naked singularities in nonminimally coupled k -essence

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
Cecília Nagy ◽  
Zoltán Keresztes ◽  
László Á. Gergely
Keyword(s):  
Black Holes ◽  
Spherically Symmetric ◽  
Naked Singularities ◽  
Scalar Hair

scholarly journals Shadows of spherically symmetric black holes and naked singularities

2018 ◽  
Vol 482 (1) ◽  
pp. 52-64 ◽  
Author(s):  
Rajibul Shaikh ◽  
Prashant Kocherlakota ◽  
Ramesh Narayan ◽  
Pankaj S Joshi
Keyword(s):  
Black Holes ◽  
Spherically Symmetric ◽  
Naked Singularities

scholarly journals GRAVITATIONAL COLLAPSE OF SPHERICALLY SYMMETRIC PERFECT FLUID WITH KINEMATIC SELF-SIMILARITY

2002 ◽  
Vol 11 (02) ◽  
pp. 155-186 ◽  
Author(s):  
C. F. C. BRANDT ◽  
L.-M. LIN ◽  
J. F. VILLAS DA ROCHA ◽  
A. Z. WANG
Keyword(s):  
Black Holes ◽  
Perfect Fluid ◽  
Gravitational Collapse ◽  
Spherically Symmetric ◽  
De Sitter ◽  
Einstein Field Equations ◽  
Field Equations ◽  
Self Similarity ◽  
Schwarzschild Solution ◽  
Naked Singularities

Analytic spherically symmetric solutions of the Einstein field equations coupled with a perfect fluid and with self-similarities of the zeroth, first and second kinds, found recently by Benoit and Coley [Class. Quantum Grav.15, 2397 (1998)], are studied, and found that some of them represent gravitational collapse. When the solutions have self-similarity of the first (homothetic) kind, some of the solutions may represent critical collapse but in the sense that now the "critical" solution separates the collapse that forms black holes from the collapse that forms naked singularities. The formation of such black holes always starts with a mass gap, although the "critical" solution has homothetic self-similarity. The solutions with self-similarity of the zeroth and second kinds seem irrelevant to critical collapse. Yet, it is also found that the de Sitter solution is a particular case of the solutions with self-similarity of the zeroth kind, and that the Schwarzschild solution is a particular case of the solutions with self-similarity of the second kind with the index α=3/2.

scholarly journals GENERATING STATIC, SPHERICALLY SYMMETRIC BLACK HOLES IN LOVELOCK GRAVITY

2009 ◽  
Vol 18 (13) ◽  
pp. 2061-2082 ◽  
Author(s):  
S. HABIB MAZHARIMOUSAVI ◽  
O. GURTUG ◽  
M. HALILSOY
Keyword(s):  
Black Holes ◽  
Higher Dimensions ◽  
Matter Field ◽  
Spherically Symmetric ◽  
Lovelock Gravity ◽  
Third Order ◽  
Naked Singularities ◽  
Test Particles ◽  
Higher Dimensional ◽  
Symmetric Black Hole

We present the generalization of a known theorem to generate static, spherically symmetric black hole solutions in higher-dimensional Lovelock gravity. Particular limits such as Gauss–Bonnet (GB) and Einstein–Hilbert (EH) in any dimension N yield all the solutions known to date with an energy–momentum. In our generalization, with special emphasis on third order Lovelock gravity, we have found two different class of solutions characterized by the matter field parameter. Several particular cases are studied and properties related to asymptotic behaviors are discussed. Our general solution, which covers topological black holes as well, splits naturally into distinct classes such as Chern–Simon (CS) and Born–Infeld (BI) in higher-dimensions. The occurence of naked singularities is studied and it is found that the space–time behaves nonsingularly in the quantum-mechanical sense when it is probed with quantum test particles. The theorem is extended to cover Bertotti–Robinson (BR) type solutions in the presence of the GB parameter alone. Finally, we prove also that extension of the theorem for a scalar–tensor source of higher dimensions (N > 4) fails to work.

HIGHER DIMENSIONAL CHARGED NULL FLUID COLLAPSE AND COSMIC CENSORSHIP

2002 ◽  
Vol 11 (02) ◽  
pp. 237-244 ◽  
Author(s):  
S. G. GHOSH ◽  
R. V. SARAYKAR
Keyword(s):  
Black Holes ◽  
Energy Condition ◽  
Cosmic Censorship ◽  
Final Outcome ◽  
Spherically Symmetric ◽  
Curvature Singularity ◽  
Naked Singularities ◽  
Dimensional Spacetime ◽  
Higher Dimensional ◽  
Strong Curvature

We analyze here the spherically symmetric collapse of a charged null fluid in a higher dimensional spacetime. Both naked singularities and black holes are shown to be developing as final outcome of the collapse. A relationship between weak energy condition and occurrence of strong curvature singularity is pointed out.

scholarly journals Spherically symmetric charged black holes with wavy scalar hair

2021 ◽  
Author(s):  
Yves Brihaye ◽  
Betti Hartmann
Keyword(s):  
Black Holes ◽  
Electromagnetic Coupling ◽  
Spherically Symmetric ◽  
Gravitational Coupling ◽  
The Novel ◽  
Maxwell Theory ◽  
Charged Black Holes ◽  
Scalar Hair ◽  
Complex Valued ◽  
Black Hole Solutions

Abstract We study standard Einstein-Maxwell theory minimally coupled to a complex valued and self-interacting scalar field. We demonstrate that new, previously unnoticed spherically symmetric, charged black hole solutions with scalar hair exist in this model for sufficiently large gravitational coupling and sufficiently small electromagnetic coupling. The novel scalar hair has the form of a spatially oscillating “wave packet” and back-reacts on the space-time such that both the Ricci and the Kretschmann scalar, respectively, possess qualitatively similar oscillations.

scholarly journals Spherically Symmetric Scalar Hair for Charged Black Holes

2020 ◽  
Vol 125 (11) ◽  
Author(s):  
Jeong-Pyong Hong ◽  
Motoo Suzuki ◽  
Masaki Yamada
Keyword(s):  
Black Holes ◽  
Spherically Symmetric ◽  
Charged Black Holes ◽  
Scalar Hair

scholarly journals Spherically symmetric black holes in f ( R ) gravity: is geometric scalar hair supported?

2016 ◽  
Vol 33 (15) ◽  
pp. 155005 ◽  
Author(s):  
Pedro Cañate ◽  
Luisa G Jaime ◽  
Marcelo Salgado
Keyword(s):  
Black Holes ◽  
Spherically Symmetric ◽  
Scalar Hair

scholarly journals Growth of accretion driven scalar hair around Kerr black holes

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
Jamie Bamber ◽  
Katy Clough ◽  
Pedro G. Ferreira ◽  
Lam Hui ◽  
Macarena Lagos
Keyword(s):  
Black Holes ◽  
Scalar Hair ◽  
Kerr Black Holes
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