scholarly journals Statistical mechanics on axially symmetric space-times with the Killing horizon and entropy of rotating black holes in induced gravity

1999 ◽  
Vol 61 (2) ◽  
Author(s):  
V. P. Frolov ◽  
D. V. Fursaev
Keyword(s):  
Black Holes ◽  
Statistical Mechanics ◽  
Symmetric Space ◽  
Axially Symmetric ◽  
Induced Gravity ◽  
Killing Horizon ◽  
Rotating Black Holes

scholarly journals Identification of a Regular Black Hole by Its Shadow

Universe ◽  
2019 ◽  
Vol 5 (7) ◽  
pp. 163 ◽  
Author(s):  
Irina Dymnikova ◽  
Kirill Kraav
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Kerr Black Hole ◽  
Axially Symmetric ◽  
De Sitter ◽  
Regular Solutions ◽  
Regular Black Hole ◽  
Rotating Black Holes ◽  
The Difference ◽  
De Sitter Vacuum

We study shadows of regular rotating black holes described by the axially symmetric solutions asymptotically Kerr for a distant observer, obtained from regular spherical solutions of the Kerr–Schild class specified by T t t = T r r ( p r = − ε ) . All regular solutions obtained with the Newman–Janis algorithm belong to this class. Their basic generic feature is the de Sitter vacuum interior. Information about the interior content of a regular rotating de Sitter-Kerr black hole can be in principle extracted from observation of its shadow. We present the general formulae for description of shadows for this class of regular black holes, and numerical analysis for two particular regular black hole solutions. We show that the shadow of a de Sitter-Kerr black hole is typically smaller than that for the Kerr black hole, and the difference depends essentially on the interior density and on the pace of its decreasing.

scholarly journals Kerr metric Killing bundles

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
D. Pugliese ◽  
H. Quevedo
Keyword(s):  
Black Holes ◽  
Rotation Axis ◽  
Outer Region ◽  
Kerr Metric ◽  
Axially Symmetric ◽  
Kerr Geometry ◽  
Inner Horizon ◽  
Killing Horizon ◽  
Extended Plane ◽  
Orbital Frequency

AbstractWe provide a complete characterization of the metric Killing bundles (or metric bundles) of the Kerr geometry. Metric bundles can be generally defined for axially symmetric spacetimes with Killing horizons and, for the case of Kerr geometries, are sets of black holes (BHs) or black holes and naked singularities (NSs) geometries. Each metric of a bundle has an equal limiting photon (orbital) frequency, which defines the bundle and coincides with the frequency of a Killing horizon in the extended plane. In this plane each bundle is represented as a curve tangent to the curve that represents the horizons, which thus emerge as the envelope surfaces of the metric bundles. We show that the horizons frequency can be used to establish a connection between BHs and NSs, providing an alternative representation of such spacetimes in the extended plane and an alternative definition of the BH horizons. We introduce the concept of inner horizon confinement and horizons replicas and study the possibility of detecting their frequencies. We study the bundle characteristic frequencies constraining the inner horizon confinement in the outer region of the plane i.e. the possibility of detect frequency related to the inner horizon, and the horizons replicas, structures which may be detectable for example from the emission spectra of BHs spacetimes. With the replicas we prove the existence of photon orbits with equal orbital frequency of the horizons. It is shown that such observations can be performed close to the rotation axis of the Kerr geometry, depending on the BH spin. We argue that these results could be used to further investigate black holes and their thermodynamic properties.

scholarly journals Black hole hair removal for N = 4 CHL models

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Subhroneel Chakrabarti ◽  
Suresh Govindarajan ◽  
P. Shanmugapriya ◽  
Yogesh K. Srivastava ◽  
Amitabh Virmani
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Degrees Of Freedom ◽  
Microscopic Analysis ◽  
Flat Space ◽  
Special Care ◽  
Hair Removal ◽  
Partition Functions ◽  
Rotating Black Holes

Abstract Although BMPV black holes in flat space and in Taub-NUT space have identical near-horizon geometries, they have different indices from the microscopic analysis. For K3 compactification of type IIB theory, Sen et al. in a series of papers identified that the key to resolving this puzzle is the black hole hair modes: smooth, normalisable, bosonic and fermionic degrees of freedom living outside the horizon. In this paper, we extend their study to N = 4 CHL orbifold models. For these models, the puzzle is more challenging due to the presence of the twisted sectors. We identify hair modes in the untwisted as well as twisted sectors. We show that after removing the contributions of the hair modes from the microscopic partition functions, the 4d and 5d horizon partition functions agree. Special care is taken to present details on the smoothness analysis of hair modes for rotating black holes, thereby filling an essential gap in the literature.

scholarly journals Rotating black holes in massive gravity

2014 ◽  
Vol 90 (8) ◽  
Author(s):  
Eugeny Babichev ◽  
Alessandro Fabbri
Keyword(s):  
Black Holes ◽  
Massive Gravity ◽  
Rotating Black Holes

scholarly journals Superradiance Resonance Cavity Outside Rapidly Rotating Black Holes

2000 ◽  
Vol 84 (20) ◽  
pp. 4537-4540 ◽  
Author(s):  
Nils Andersson ◽  
Kostas Glampedakis
Keyword(s):  
Black Holes ◽  
Rotating Black Holes ◽  
Resonance Cavity
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