https://doi.org/10.1140/epjc/s10052-015-3845-3
Comment
Numerical evidence for universality in the relaxation dynamics of near-extremal Kerr–Newman black holes
1
The Ruppin Academic Center, Emeq Hefer, 40250, Israel
2
The Hadassah Institute, Jerusalem, 91010, Israel
* e-mail: shaharhod@gmail.com
Received:
20
November
2015
Accepted:
10
December
2015
Published online:
22
December
2015
The coupled gravitational-electromagnetic quasinormal resonances of charged rotating Kerr–Newman black holes are explored. In particular, using the recently published numerical data of Dias et al. (Phys Rev Lett 114:151101, 2015), we show that the characteristic relaxation times 
of near-extremal Kerr–Newman black holes in the regime 
are described, to a very good degree of accuracy, by the simple universal relation 
(here 
, and 
are respectively the electric charge, horizon radius, and temperature of the Kerr–Newman black hole, and 
is the fundamental quasinormal resonance of the perturbed black-hole spacetime).
© The Author(s), 2015
