Quasinormal modes of black holes immersed in a strong magnetic field

Details Quasinormal modes of black holes immersed in a strong magnetic field Quasinormal modes of black holes immersed in a strong magnetic field

2007-07-08

arxiv.org/abs/0707.1156v2

Phys. Lett B 659, (2008), 375-379

Physics

High Energy Physics

High Energy Physics - Theory

5 pages, RevTex

Scientific paper

10.1016/j.physletb.2007.10.065

We found quasinormal modes, both in time and frequency domains, of the Ernst black holes, that is neutral black holes immersed in an external magnetic field. The Ernst solution reduces to the Schwarzschild solution, when the magnetic field vanishes. It is found that the quasinormal spectrum for massless scalar field in the vicinity of the magnetized black holes acquires an effective "mass" $\mu = 2 B m$, where m is the azimuthal number and B is parameter describing the magnetic field. We shall show that in the presence of a magnetic field quasinormal modes are longer lived and have larger oscillation frequencies. The perturbations of higher dimensional magnetized black holes by Ortaggio and of magnetized dilaton black holes by Radu are considered.

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