56 citations
25 papers
Evaluation of vacuum energy density around geometrical defects by the WKB method
Kiyoshi Shiraishi
The energy density of a conformally invariant scalar field around a cosmic string is estimated by the WKB method. This approach reproduces the precise value obtained by the other a…
Classical and quantum scattering of maximally charged dilaton black holes
Kiyoshi Shiraishi
The classical and the quantum scattering of two maximally-charged dilaton black holes which have low velocities are studied. We find a critical value for the dilaton coupling, $a^2…
Vacuum polarization near asymptotically anti-de Sitter black holes in odd dimensions
Kiyoshi Shiraishi, Takuya Maki
Recently, Bañados, Teitelboim and Zanelli obtained spherically symmetric black hole solutions in a particular class of Einstein--Lovelock gravity. We derive the propagator in an ex…
Quantum aspects of self-interacting fields around cosmic strings
Kiyoshi Shiraishi, Satoru Hirenzaki
The authors study the quantum effect of self-interacting fields in the classical background of conical space, i.e. around a cosmic string with infinitesimal width. The renormalized…
Charged black holes in a six-dimensional vector-tensor theory
Kiyoshi Shiraishi
We study a six-dimensional vector-tensor gravitation theory compactified to M_4 x S^2. Here, static spherically-symmetric solutions to the field equations of the theory are investi…
Quantum fluctuation of stress tensor and black holes in three dimensions
Kiyoshi Shiraishi, Takuya Maki
The quantum stress tensor near a three-dimensional black hole is studied for a conformally coupled scalar field. The back reaction to the metric is also investigated.