scholarly journals Geodesics with negative energy in the ergosphere of rotating black holes

2014 ◽  
Vol 29 (20) ◽  
pp. 1450110 ◽  
Author(s):  
A. A. Grib ◽  
Yu. V. Pavlov ◽  
V. D. Vertogradov
Keyword(s):  
Black Holes ◽  
Negative Energy ◽  
Gravitational Radius ◽  
Rotating Black Holes

It is shown that the geodesics with negative energy for rotating black holes cannot originate or terminate inside the ergosphere. Their length is always finite and this leads to conclusion that they must originate and terminate inside the gravitational radius of the ergosphere.

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

scholarly journals Probing the universality of synchronised hair around rotating black holes with Q-clouds

2018 ◽  
Vol 779 ◽  
pp. 151-159 ◽  
Author(s):  
Carlos Herdeiro ◽  
Jutta Kunz ◽  
Eugen Radu ◽  
Bintoro Subagyo
Keyword(s):  
Black Holes ◽  
Rotating Black Holes

Rotating black holes

2010 ◽  
pp. 194-212
Author(s):  
Jerry B. Griffiths ◽  
Jiri Podolsky
Keyword(s):  
Black Holes ◽  
Rotating Black Holes

Vacuum polarization of massive fields near rotating black holes

1984 ◽  
Vol 29 (6) ◽  
pp. 1057-1066 ◽  
Author(s):  
V. P. Frolov ◽  
A. I. Zel'nikov
Keyword(s):  
Black Holes ◽  
Vacuum Polarization ◽  
Rotating Black Holes ◽  
Massive Fields
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