https://doi.org/10.1140/epjc/s10052-024-13206-6
Regular Article - Theoretical Physics
Asymptotic decay and quasinormal frequencies of scalar and Dirac fields around dilaton-de Sitter black holes
1
University of Seville, 41009, Seville, Spain
2
Research Centre for Theoretical Physics and Astrophysics, Institute of Physics, Silesian University in Opava, Bezručovo nám. 13, 74601, Opava, Czech Republic
Received:
22
April
2024
Accepted:
6
August
2024
Published online:
22
August
2024
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.
© The Author(s) 2024
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