Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2003-10-20
Class.Quant.Grav. 21 (2004) 2393-2405
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
15 pages, uses iopart.cls and setstack.sty V2: Two references added. Also, the appendix now relates our computation of the Reg
Scientific paper
10.1088/0264-9381/21/9/013
We consider the quasinormal modes for a class of black hole spacetimes that, informally speaking, contain a closely ``squeezed'' pair of horizons. (This scenario, where the relevant observer is presumed to be ``trapped'' between the horizons, is operationally distinct from near-extremal black holes with an external observer.) It is shown, by analytical means, that the spacing of the quasinormal frequencies equals the surface gravity at the squeezed horizons. Moreover, we can calculate the real part of these frequencies provided that the horizons are sufficiently close together (but not necessarily degenerate or even ``nearly degenerate''). The novelty of our analysis (which extends a model-specific treatment by Cardoso and Lemos) is that we consider ``dirty'' black holes; that is, the observable portion of the (static and spherically symmetric) spacetime is allowed to contain an arbitrary distribution of matter.
Martin Damien
Medved A. J. M.
Visser Matt
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