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Asymptotic decay and quasinormal frequencies of scalar and Dirac fields around dilaton-de Sitter black holes

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arxiv 2404.01834 v2 pith:QKTHPIDV submitted 2024-04-02 gr-qc

Alexey Dubinsky , Antonina Zinhailo This is my paper
classification gr-qc
keywords asymptoticallydecayscalarsitterasymptoticblackdiracexponential
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We study the decay of Dirac and massive scalar fields at asymptotically late times in the background of the charged asymptotically de Sitter dilatonic black holes. It is shown that the asymptotic decay is exponential and oscillatory for large and intermediate mass of the field, while for zero and small mass it is pure exponential without oscillations. This reflects the dominance of quasinormal modes of the empty de Sitter spacetime at asymptotically late times. We also show that the earlier WKB calculation of the massive scalar field spectrum does not allow one to find the fundamental mode with reasonable accuracy.

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