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8 papers · 2 filters
3D Simulation of Spindle Gravitational Collapse of a Collisionless Particle System
Chul-Moon Yoo, Tomohiro Harada, Hirotada Okawa
We simulate the spindle gravitational collapse of a collisionless particle system in a 3D numerical relativity code and compare the qualitative results with the old work done by Sh…
Energy extraction from Kerr black holes by rigidly rotating strings
Shunichiro Kinoshita, Takahisa Igata, Kentaro Tanabe
In this paper, we show that a rigidly rotating string can extract the rotational energy from a rotating black hole. We consider Nambu-Goto strings stationary with respect to a coro…
Self-similar motion of a Nambu-Goto string
Takahisa Igata, Tsuyoshi Houri, Tomohiro Harada
We study the self-similar motion of a string in a self-similar spacetime by introducing the concept of a self-similar string, which is defined as the world sheet to which a homothe…
Escape probability of the super-Penrose process
Kota Ogasawara, Tomohiro Harada, Umpei Miyamoto +1
We consider a head-on collision of two massive particles that move in the equatorial plane of an extremal Kerr black hole, which results in the production of two massless particles…
Consistent analytic approach to the efficiency of collisional Penrose process
Tomohiro Harada, Kota Ogasawara, Umpei Miyamoto
We propose a consistent analytic approach to the efficiency of collisional Penrose process in the vicinity of a maximally rotating Kerr black hole. We focus on a collision with arb…
Tidal deformability and I-Love-Q relations for gravastars with polytropic thin shells
Nami Uchikata, Shijun Yoshida, Paolo Pani
The moment of inertia, the spin-induced quadrupole moment, and the tidal Love number of neutron-star and quark-star models are related through some relations which depend only mild…