Publication date: Sep 2017
Abstract:
We study scalar and electromagnetic perturbations of a family of
nonsingular nonrotating black hole spacetimes that are solutions in a
large class of conformally invariant theories of gravity. The effective
potential for scalar perturbations depends on the exact form of the
scaling factor. Electromagnetic perturbations do not feel the scaling
factor, and the corresponding quasinormal mode spectrum is the same as
in the Schwarzschild metric. We find that these black hole metrics are
stable under scalar and electromagnetic perturbations. Assuming that the
quasinormal mode spectrum for scalar perturbations is not too different
from that for gravitational perturbations, we can expect that the
calculation of the quasinormal mode spectrum and the observation with
gravitational wave detectors of quasinormal modes from astrophysical
black holes can constrain the scaling factor and test these solutions.
Authors:
Toshmatov, Bobir; Bambi, Cosimo; Ahmedov, Bobomurat; Stuchlík, Zdeněk; Schee, Jan;