https://doi.org/10.1140/epjc/s10052-015-3466-x
Letter
Universality of the quasinormal spectrum of near-extremal Kerr–Newman black holes
1
The Ruppin Academic Center, 40250, Emeq Hefer, Israel
2
The Hadassah Institute, 91010, Jerusalem, Israel
* e-mail: shaharhod@gmail.com
Received:
28
January
2015
Accepted:
18
May
2015
Published online:
23
June
2015
Our current knowledge about the quasinormal resonance spectrum of charged and rotating Kerr–Newman black holes is quite poor. This unsatisfactory situation is a direct consequence of the fact that all attempts to decouple the gravitational and electromagnetic perturbations of generic Kerr–Newman black holes have failed thus far. Recently, Zilhão et al. (Phys Rev D 90:12, 124088, 2014. arXiv:1410.0694) have studied the nonlinear stability of Kerr–Newman black holes. We show here that their numerical results for the time evolutions of the spacetime deformations of near-extremal Kerr–Newman black holes are described extremely well by a simple and universal analytical formula for the quasinormal resonances of the black holes. This formula is expressed in terms of the black-hole physical parameters: the horizon angular velocity 
and the Bekenstein–Hawking temperature 
.
© The Author(s), 2015
