86 citations · 665 across the 26 of their papers we have counts for
12 papers · 1 filter
Amplification of azimuthal modes with odd wave numbers during dynamical bar-mode growth in rotating stars
Yasufumi Kojima, Motoyuki Saijo
Nonlinear growth of the bar-mode deformation is studied for a differentially rotating star with supercritical rotational energy. In particular, the growth mechanism of some azimuth…
Faraday resonance in dynamical bar instability of differentially rotating stars
Motoyuki Saijo, Yasufumi Kojima
We investigate the nonlinear behaviour of the dynamically unstable rotating star for the bar mode by three-dimensional hydrodynamics in Newtonian gravity. We find that an oscillati…
Viscosity driven instability in rotating relativistic stars
Motoyuki Saijo, Eric Gourgoulhon
We investigate the viscosity driven instability in rotating relativistic stars by means of an iterative approach. We focus on polytropic rotating equilibrium stars and impose an m=…
Low T/|W| dynamical instabilities in differentially rotating stars: Diagnosis with canonical angular momentum
Motoyuki Saijo, Shin'ichirou Yoshida
We study the nature of non-axisymmetric dynamical instabilities in differentially rotating stars with both linear eigenmode analysis and hydrodynamic simulations in Newtonian gravi…
Dynamical bar instability in a relativistic rotational core collapse
Motoyuki Saijo
We investigate the rotational core collapse of a rapidly rotating relativistic star by means of a 3+1 hydrodynamical simulations in conformally flat spacetime of general relativity…
Low T/|W| dynamical instability in differentially rotating stars: Diagnosis with canonical angular momentum
Motoyuki Saijo, Shin'ichirou Yoshida
We study the nature of non-axisymmetric dynamical instabilities in differentially rotating stars with both linear eigenmode analysis and hydrodynamic simulations in Newtonian gravi…
Dynamical One-Armed Spiral Instability in Differentially Rotating Stars
Motoyuki Saijo, Shin'ichirou Yoshida
We investigate the dynamical one-armed spiral instability in differentially rotating stars with both eigenmode analysis and hydrodynamic simulations in Newtonian gravity. We find t…
The Collapse of Differentially Rotating Supermassive Stars: Conformally Flat Simulations
Motoyuki Saijo
We investigate the gravitational collapse of rapidly rotating relativistic supermassive stars by means of a 3+1 hydrodynamical simulations in conformally flat spacetime of general…
Collapse of a Rotating Supermassive Star to a Supermassive Black Hole: Post-Newtonian Simulations
Motoyuki Saijo, Thomas W. Baumgarte, Stuart L. Shapiro +1
We study the gravitational collapse of a rotating supermassive star (SMS) by means of a (3+1) hydrodynamical simulation in a post-Newtonian (PN) approxi- mation of general relativi…
Possible direct method to determine the radius of a star from the spectrum of gravitational wave signals II : Spectra for various cases
Motoyuki Saijo, Takashi Nakamura
We compute the spectrum and the waveform of gravitational waves generated by the inspiral of a disk or a spherical like dust body into a Kerr black hole. We investigate the effect…
Dynamical Bar Instability in Rotating Stars: Effect of General Relativity
Motoyuki Saijo, Masaru Shibata, Thomas W. Baumgarte +1
We study the dynamical stability against bar-mode deformation of rapidly and differentially rotating stars in the first post-Newtonian approximation of general relativity. We vary…
Possible direct method to determine the radius of a star from the spectrum of gravitational wave signals
Motoyuki Saijo, Takashi Nakamura
We computed the spectrum of gravitational waves from a dust disk star of radius R inspiraling into a Kerr black hole of mass M and specific angular momentum a. We found that when R…