282 citations · 2.7k across the 89 of their papers we have counts for
90 papers
Radiative gravastar with thermal spectrum; Sudden vacuum condensation without gravitational collapse
Ken-ichi Nakao, Kazumasa Okabayashi, Tomohiro Harada
The gravastar is an exotic compact object proposed as a final product of gravitational collapse of a massive object in order to resolve problems associated with black holes. It is…
Relativistic orbits of S2 star in the presence of scalar field
Parth Bambhaniya, Ashok B. Joshi, Dipanjan Dey +4
The general theory of relativity predicts the relativistic effect in the orbital motions of S-stars which are orbiting around our Milky-way galactic center. The post-Newtonian or h…
Radiative gravastar with Gibbons-Hawking temperature
Ken-ichi Nakao, Kazumasa Okabayashi, Tomohiro Harada
We study the quantum particle creation in a toy model of spherically symmetric gravitational collapse whose final product is not a black hole but a gravastar. Precedent studies rev…
Robustness of particle creation in the formation of a compact object
Kazumasa Okabayashi, Tomohiro Harada, Ken-ichi Nakao
Hawking has predicted that the formation of a black hole by gravitational collapse causes quantum particle creation and the spectrum of the particles is almost thermal. This phenom…
Current status of space gravitational wave antenna DECIGO and B-DECIGO
Seiji Kawamura, Masaki Ando, Naoki Seto +84
Deci-hertz Interferometer Gravitational Wave Observatory (DECIGO) is the future Japanese space mission with a frequency band of 0.1 Hz to 10 Hz. DECIGO aims at the detection of pri…
Do black hole shadows merge?
Kazumasa Okabayashi, Nobuyuki Asaka, Ken-ichi Nakao
The so-called black hole shadow is not a silhouette of a black hole but an image of a collapsing object or a white hole. Hence it is non-trivial whether black hole shadows merge wi…