89 citations · 774 across the 55 of their papers we have counts for
6 papers · 1 filter
Slowly Decaying Ringdown of a Rapidly Spinning Black Hole: Probing the No-Hair Theorem by Small Mass-Ratio Mergers with LISA
Naritaka Oshita, Daichi Tsuna
The measurability of multiple quasinormal (QN) modes, including overtones and higher harmonics, with the Laser Interferometer Space Antenna is investigated by computing the gravita…
dS universe emergent from Kerr-AdS spacetime: bubble nucleation catalyzed by a black hole
Issei Koga, Naritaka Oshita, Kazushige Ueda
The emergence of a four-dimensional de Sitter (dS) universe on an expanding bubble in the five-dimensional anti-de Sitter (AdS) background has been suggested as a possi…
Thermal Ringdown of a Kerr Black Hole: Overtone Excitation, Fermi-Dirac Statistics and Greybody Factor
Naritaka Oshita
We find a significant destructive interference among Kerr overtones in the early ringdown induced by an extreme mass-ratio merger of a massive black hole and a compact object, and…
Evaporation of Echoing Black Holes
Naritaka Oshita, Hayato Motohashi, Sousuke Noda
We compute the graybody factor and evaporation rate of a rotating black hole in the presence of a hypothetical reflective surface slightly outside the outer horizon radius, assumin…
Global study of the scalar quasi-normal modes of Kerr-AdS black holes: Stability, thermality, and horizon area quantization
Issei Koga, Naritaka Oshita, Kazushige Ueda
We numerically explore the structure of quasi-normal (QN) frequencies of the five-dimensional small and large Kerr-anti de Sitter (Kerr-AdS) black hole with equal and unequal…
Vacuum decay in the Lorentzian path integral
Takumi Hayashi, Kohei Kamada, Naritaka Oshita +1
We apply the Lorentzian path integral to the decay of a false vacuum and estimate the false-vacuum decay rate. To make the Lorentzian path integral convergent, the deformation of a…