Nonmonotonic Keplerian velocity profiles around nearextreme braneworld Kerr black holes
Abstract
We study the nonmonotonic Keplerian velocity profiles related to locally nonrotating frames (LNRF) in the field of nearextreme braneworld Kerr black holes and naked singularities in which the nonlocal gravitational effects of the bulk are represented by a braneworld tidal charge b and the 4D geometry of the spacetime structure is governed by the KerrNewman geometry. We show that positive tidal charge has a tendency to restrict the values of the black hole dimensionless spin a admitting the existence of the nonmonotonic Keplerian LNRFvelocity profiles; the nonmonotonic profiles exist in the black hole spacetimes with tidal charge smaller than b = 0.410 05 (and spin larger than a = 0.768 08). With decreasing value of the tidal charge (which need not be only positive), both the region of spin allowing the nonmonotonicity in the LNRFvelocity profile around braneworld Kerr black hole and the velocity difference in the minimummaximum parts of the velocity profile increase implying growing astrophysical relevance of this phenomenon.
 Publication:

Classical and Quantum Gravity
 Pub Date:
 September 2011
 DOI:
 10.1088/02649381/28/17/175002
 arXiv:
 arXiv:1108.0191
 Bibcode:
 2011CQGra..28q5002S
 Keywords:

 General Relativity and Quantum Cosmology
 EPrint:
 Class. Quantum Grav. 28 (2011) 175002