2 research outputs found
Quasinormal modes in the field of a dyon-like dilatonic black hole
Quasinormal modes of massless test scalar field in the background of
gravitational field for a non-extremal dilatonic dyonic black hole are
explored. The dyon-like black hole solution is considered in the gravitational
model involving two scalar fields and two 2-forms. It is governed by two
2-dimensional dilatonic coupling vectors obeying
, . The first
law of black hole thermodynamics is given and the Smarr relation is verified.
Quasinormal modes for a massless scalar (test) field in the eikonal
approximation are obtained and analysed. These modes depend upon a
dimensionless parameter () which is a function of
. For limiting strong () and weak () coupling
cases, they coincide with the well-known results for the Schwarzschild and
Reissner-Nordstr\"om solutions. It is shown that the Hod conjecture, connecting
the damping rate and the Hawking temperature, is satisfied for
and all allowed values of parameters.Comment: 13 pages, 5 (double) figures, LaTex. Subsection 3.3 is extended; two
typos in formulas (22) and (30) are eliminated; 2 figures and 3 references
are added; a paragraph in Sec. 1 and Remark on page 10 are added; several
phrases are modified. To be published in EPJ