Publication date: Apr 2015
We study scalar, electromagnetic, and gravitational test fields in the
Hayward, Bardeen, and Ayón-Beato-García regular black hole
spacetimes and demonstrate that the test fields are stable in all of
these spacetimes. Using the sixth order WKB approximation of the linear
"axial" perturbative scheme, we determine dependence of the quasinormal
mode (QNM) frequencies on the characteristic parameters of the test
fields and the spacetime charge parameters of the regular black holes.
We give also the grey body factors, namely, the transmission and
reflection coefficients of scattered scalar, electromagnetic, and
gravitational waves. We show that the damping of the quasinormal modes
in regular black hole spacetimes is suppressed compared to the case of
Schwarzschild black holes, and increasing the charge parameter of the
regular black holes increases reflection and decreases the transmission
factor of the incident waves for each of the test fields.
Toshmatov, Bobir; Abdujabbarov, Ahmadjon; Stuchlík, Zdeněk; Ahmedov, Bobomurat;