282 citations · 2.7k across the 89 of their papers we have counts for
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Construction of KAGRA: an Underground Gravitational Wave Observatory
T. Akutsu, M. Ando, S. Araki +222
Major construction and initial-phase operation of a second-generation gravitational-wave detector KAGRA has been completed. The entire 3-km detector is installed underground in a m…
The status of KAGRA underground cryogenic gravitational wave telescope
KAGRA Collaboration, T. Akutsu, M. Ando +146
KAGRA is a 3-km interferometric gravitational wave telescope located in the Kamioka mine in Japan. It is the first km-class gravitational wave telescope constructed underground to…
Non-linear collisional Penrose process: How large energy can a black hole release?
Ken-ichi Nakao, Hirotada Okawa, Kei-ichi Maeda
Energy extraction from a rotating or charged black hole is one of fascinating issues in general relativity. The collisional Penrose process is one of such extraction mechanisms and…
On the stability of a superspinar
Ken-ichi Nakao, Pankaj S. Joshi, Jun-Qi Guo +5
The superspinar proposed by Gimon and Horava is a rapidly rotating compact entity whose exterior is described by the over-spinning Kerr geometry. The compact entity itself is expec…
Spins of primordial black holes formed in the matter-dominated phase of the Universe
Tomohiro Harada, Chul-Moon Yoo, Kazunori Kohri +1
Angular momentum plays very important roles in the formation of PBHs in the matter-dominated phase if it lasts sufficiently long. In fact, most collapsing masses are bounced back d…
Non-linear stability of a brane wormhole
Yumi Akai, Ken-ichi Nakao
We analytically study the non-linear stability of a spherically symmetric wormhole supported by an infinitesimally thin brane of negative tension, which has been devised by Barcelo…