Quasinormal modes, stability analysis and absorption cross section for 4-dimensional topological Lifshitz black hole

Abstract

We study scalar perturbations in the background of a topological Lifshitz black hole in four dimensions. We compute analytically the quasinormal modes and from these modes we show that topological Lifshitz black hole is stable. On the other hand, we compute the reflection and transmission coefficients and the absorption cross section and we show that there is a range of modes with high angular momentum which contributes to the absorption cross section in the low frequency limit. Furthermore, in this limit, we show that the absorption cross section decreases if the scalar field mass increases, for a real scalar field mass. © 2012 Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica.