Publication date: Jul 2017
Abstract:
We study in special limiting cases quasinormal modes of massive scalar
fields in the Schwarzschild-de Sitter black hole backgrounds. We
determine the lower limit on the mass parameter of the scalar field that
allows the waves with quasinormal frequencies to propagate to infinity,
showing that it depends on the spacetime parameters only. Then we
discuss in the large multipole number limit quasinormal modes, whose
frequencies can be directly related to the unstable circular photon
geodesics. In the large scalar mass approximation, we demonstrate the
new interesting phenomenon of slowly decaying resonances, that are
strongly related to the maximum of the effective potential of the
massive scalar field, which is located at the static radius of the
Schwarzschild-de Sitter spacetimes, where the cosmic repulsion is just
balanced by the black hole attraction.
Authors:
Toshmatov, Bobir; Stuchlík, Zdeněk;