Echoes from Classical Black Holes
arXiv:2112.14780 · doi:10.1103/PhysRevD.105.104049
Abstract
We study echoes of free massless scalar from dyonic black holes in Einstein-Maxwell gravity extended with the quasi-topological electromagnetic term. These asymptotically-flat black holes all satisfy the dominant energy condition. We find that for suitable parameters, the effective potential can have double peaks and consequently echoes of quasinormal modes arise. In general the echo frequency associated with the initial wave packet released inside the two peaks is about twice the frequency of the one released outside.
arXiv commentLatex, 20 pages, 29 plots grouped into 11 figures
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