scholarly journals A bound on the effective gravitational coupling from semiclassical black holes

2009 ◽  
Vol 2009 (10) ◽  
pp. 085-085 ◽  
Author(s):  
R Brustein ◽  
G Dvali ◽  
G Veneziano
Keyword(s):  
Black Holes ◽  
Gravitational Coupling

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 Gravitating Cho–Maison monopole

2021 ◽  
Vol 81 (10) ◽  
Author(s):  
Khai-Ming Wong ◽  
Dan Zhu ◽  
Guo-Quan Wong
Keyword(s):  
Black Holes ◽  
Numerical Solutions ◽  
Flat Space ◽  
Spherically Symmetric ◽  
Gravitational Coupling ◽  
Yang Mills ◽  
Charged Black Holes ◽  
Monopole Solution

AbstractWe study numerical solutions corresponding to spherically symmetric gravitating electroweak monopole and magnetically charged black holes of the Einstein–Weinberg–Salam theory. The gravitating electroweak monopole solutions are quite identical to the gravitating monopole solution in SU(2) Einstein–Yang–Mills–Higgs theory, but with distinctive characteristics. We also found solutions representing radially excited monopole, which has no counterpart in flat space. Both of these solutions exist up to a maximal gravitational coupling before they cease to exist. Lastly we also report on magnetically charged non-Abelian black holes solutions that is closely related to the regular monopole solutions, which represents counterexample to the ‘no-hair’ conjecture.

scholarly journals The effects of running gravitational coupling on rotating black holes

2018 ◽  
Vol 78 (6) ◽  
Author(s):  
Sumarna Haroon ◽  
Mubasher Jamil ◽  
Kai Lin ◽  
Petar Pavlovic ◽  
Marko Sossich ◽  
...  
Keyword(s):  
Black Holes ◽  
Gravitational Coupling ◽  
Rotating Black Holes

Black holes have ring of truth

Nature ◽  
2002 ◽  
Author(s):  
Philip Ball
Keyword(s):  
Black Holes
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