Yasutake, Nobutoshi, Kiuchi, Kenta, Kotake, Kei
We investigate structures of hybrid stars, which feature quark core surrounded by a hadronic matter mantle, with super-strong toroidal magnetic fields in full general relativity. Modeling the...
Ando, Masaki, Kawamura, Seiji, Sato, Shuichi, Nakamura, Takashi, Tsubono, Kimio, Araya, Akito, ...
DECIGO pathfinder (DPF) is a milestone satellite mission for DECIGO (DECi-hertz Interferometer Gravitational wave Observatory), which is a future space gravitational wave antenna. DECIGO is expected...
Longterm general relativistic simulation of binary neutron stars collapsing to a black hole (2009)
Kiuchi, Kenta, Sekiguchi, Yuichiro, Shibata, Masaru, Taniguchi, Keisuke
General relativistic simulations for the merger of binary neutron stars are performed as an extension of a previous work\cite{Shibata:2006nm}. We prepare binary neutron stars with a large initial...
General relativistic compact stars with exotic matter (2009)
Yasutake, Nobutoshi, Maruyama, Toshiki, Tatsumi, Toshitaka, Kiuchi, Kenta, Kotake, Kei
We study structures of general relativistic compact stars with exotic matter. Our study is based on axisymetric and stationary formalism including purely toroidal magnetic field. We also study the...
Relativistic stars with purely toroidal magnetic fields with realistic equations of state (2009)
Kiuchi, Kenta, Kotake, Kei, Yoshida, Shijun
We investigate equilibrium sequences of relativistic stars containing purely toroidal magnetic fields with four kinds of realistic equations of state (EOSs) of SLy (Douchin et al.), FPS...
Ando, Masaki, Kawamura, Seiji, Nakamura, Takashi, Tsubono, Kimio, Tanaka, Takahiro, Funaki, Ikkoh, ...
DECIGO pathfinder (DPF) is a milestone satellite mission for DECIGO (DECi-hertz Interferometer Gravitational wave Observatory) which is a future space gravitational wave antenna. DECIGO is expected...
The Japanese space gravitational wave antenna; DECIGO (2008)
Kawamura, Seiji, Ando, Masaki, Nakamura, Takashi, Tsubono, Kimio, Tanaka, Takahiro, Funaki, Ikkoh, ...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational wave antenna. DECIGO is expected to open a new window of observation for gravitational...
Kiuchi, Kenta, Shibata, Masaru, Yoshida, Shijun
We study the stability of neutron stars with toroidal magnetic fields by magnetohydrodynamic simulation in full general relativity under assumption of axial symmetry. Nonrotating and rigidly rotating...
Relativistic stars with purely toroidal magnetic fields (2008)
Kiuchi, Kenta, Yoshida, Shijun
We investigate the effects of the purely toroidal magnetic field on the equilibrium structures of the relativistic stars. The master equations for obtaining equilibrium solutions of relativistic...
Numerical experiments of adjusted BSSN systems for controlling constraint violations (2007)
Kiuchi, Kenta, Shinkai, Hisa-aki
We present our numerical comparisons between the BSSN formulation widely used in numerical relativity today and its adjusted versions using constraints. We performed three testbeds: gauge-wave,...
1/f fluctuations in spinning-particle motions around a Schwarzschild black hole (2007)
Koyama, Hiroko, Kiuchi, Kenta, Konishi, Tetsuro
We study the properties of chaos in the motions of a spinning test particle in Schwarzschild spacetime. We characterize the chaos using the power spectrum of the time series of z components of the...
We investigate equilibrium sequences of magnetized rotating stars with four kinds of realistic equations of state (EOSs) of SLy (Douchin et al.), FPS (Pandharipande et al.), Shen (Shen et al.), and...
Gravitational Wave Signals from Chaotic System: A Point Mass with A Disk (2007)
Kiuchi, Kenta, Koyama, Hiroko, Maeda, Kei-ichi
We study gravitational waves from a particle moving around a system of a point mass with a disk in Newtonian gravitational theory. A particle motion in this system can be chaotic when the...
1/f fluctuations in spinning-particle motions around Schwarzschild black hole (2007)
Koyama, Hiroko, Kiuchi, Kenta, Konishi, Tetsuro
We study the properties of chaos in the motions of a spinning test particle in Schwarzschild spacetime. We characterize the chaos using the power spectrum of the time series of $z$ components of the...
Chaotic dynamical system and gravitational waves (2007)
制度:新 ; 文部省報告番号:甲2499号 ; 学位の種類:博士(理学) ; 授与年月日:2007/9/15 ; 早大学位記番号:新4614
Gravitational Waves from Chaotic Dynamical System (2004)
Kiuchi, Kenta, Maeda, Kei-ichi
To investigate how chaos affects gravitational waves, we study the gravitational waves from a spinning test particle moving around a Kerr black hole, which is a typical chaotic system. To compare the...