128 citations · 305 across the 4 of their papers we have counts for
5 papers
A detailed study of quasinormal frequencies of the Kerr black hole
Hisashi Onozawa
We compute the quasinormal frequencies of the Kerr black hole using a continued fraction method. The continued fraction method first proposed by Leaver is still the only known meth…
Quasinormal modes of nearly extreme Reissner-Nordstrom black holes
Nils Andersson, Hisashi Onozawa
We present detailed calculations of the quasinormal modes of Reissner-Nordstrom black holes. While the first few, slowly damped, modes depend on the charge of the black hole in a r…
Perturbing Supersymmetric Black Hole
Hisashi Onozawa, Takashi Okamura, Takashi Mishima +1
An investigation of the perturbations of the Reissner-Nordström black hole in the supergravity is presented. We prove in the extremal limit that the black hole responds to th…
Quasinormal modes of maximally charged black holes
Hisashi Onozawa, Takashi Mishima, Takashi Okamura +1
A new algorithm for computing the accurate values of quasinormal frequencies of extremal Reissner-Nordström black holes is presented. The numerically computed values are consistent…
Causal Feature of Central Singularity and Gravitational Mass
Tatsuhiko Koike, Hisashi Onozawa, Masaru Siino
Mass of singularity is defined, and its relation to whether the singularity is spacelike, timelike or null is discussed for spherically symmetric spacetimes. It is shown that if th…