Maximal slicing of D-dimensional spherically-symmetric vacuum spacetime (2009)
Nakao, Ken-ichi, Abe, Hiroyuki, Yoshino, Hirotaka, Shibata, Masaru
We study the foliation of a $D$-dimensional spherically symmetric black-hole spacetime with $D\ge 5$ by two kinds of one-parameter family of maximal hypersurfaces: a reflection-symmetric foliation...
Non-conformally flat initial data for binary compact objects (2009)
Uryu, Koji, Limousin, Francois, Friedman, John L., Gourgoulhon, Eric, Shibata, Masaru
A new method is described for constructing initial data for a binary neutron-star (BNS) system in quasi-equilibrium circular orbit. Two formulations for non-conformally flat data, waveless (WL) and...
Higher-dimensional numerical relativity: Formulation and code tests (2009)
Yoshino, Hirotaka, Shibata, Masaru
We derive a formalism of numerical relativity for higher-dimensional spacetimes and develop numerical codes for simulating a wide variety of five-dimensional (5D) spacetimes for the first time....
Quasiequilibrium states of black hole-neutron star binaries in the moving-puncture framework (2009)
Kyutoku, Koutarou, Shibata, Masaru, Taniguchi, Keisuke
General relativistic quasiequilibrium states of black hole-neutron star binaries are computed in the moving-puncture framework. We propose three conditions for determining the quasiequilibrium states...
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...
Gravitational waves from black hole-neutron star binaries I: Classification of waveforms (2009)
Shibata, Masaru, Kyutoku, Kohtaro, Yamamoto, Tetsuro, Taniguchi, Keisuke
Using our new numerical-relativity code SACRA, long-term simulations for inspiral and merger of black hole (BH)-neutron star (NS) binaries are performed, focusing particularly on gravitational...
Measuring the neutron star equation of state with gravitational wave observations (2009)
Read, Jocelyn S., Markakis, Charalampos, Shibata, Masaru, Uryu, Koji, Creighton, Jolien D. E., Friedman, John L.
We report the results of a first study that uses numerical simulations to estimate the accuracy with which one can use gravitational wave observations of double neutron star inspiral to measure...
High-velocity collision of two black holes (2008)
Shibata, Masaru, Okawa, Hirotada, Yamamoto, Tetsuro
We study nonaxisymmetric collision of two black holes (BHs) with a high velocity $v=|dx^i/dx^0|=0.6$--$0.9c$ at infinity, where $x^{\mu}$ denotes four-dimensional coordinates. We prepare two boosted...
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...
Simulating coalescing compact binaries by a new code SACRA (2008)
Yamamoto, Tetsuro, Shibata, Masaru, Taniguchi, Keisuke
We report our new code (named SACRA) for numerical relativity simulations in which an adaptive mesh refinement algorithm is implemented. In this code, the Einstein equations are solved in the BSSN...
NADA: A new code for studying self-gravitating tori around black holes (2008)
Montero, Pedro J., Font, Jose A., Shibata, Masaru
We present a new two-dimensional numerical code called Nada designed to solve the full Einstein equations coupled to the general relativistic hydrodynamics equations. The code is mainly intended for...
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...
Ando, M., Kawamura, Seiji, Nakamura, T., Tsubono, K., Tanaka, T., Funaki, I., ...
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, M., Nakamura, T., Tsubono, K., Tanaka, T., Funaki, I., ...
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...
The Japanese space gravitational wave antenna - DECIGO (2008)
Kawamura, Seiji, Ando, M., Nakamura, T., Tsubono, K., Tanaka, T., Funaki, I., ...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational wave antenna. The goal of DECIGO is to detect gravitational waves from various kinds of...
Masaru Shibata, Keisuke Taniguchi, Takashi Nakamura
In this paper, we present results obtained from our recent studies on the location of the innermost stable circular orbit (ISCO) for binary neutron stars (BNSs) in several levels of post Newtonian...
Post-Newtonian Hydrodynamic Equations Using the (3+1) Formalism in General Relativity (2007)
Hideki Asada, Masaru Shibata, Toshifumi Futamase
Using the (3+1) formalism in general relativity, we perform the post-Newtonian(PN) approximation to clarify what sort of gauge condition is suitable for numerical analysis of coalescing compact...
Shibata, Masaru, Taniguchi, Keisuke
We systematically perform the merger simulation of black hole-neutron star (BH-NS) binaries in full general relativity, focusing on the case that the NS is tidally disrupted. We prepare BH-NS...
A Formation Mechanism of Collapsar Black Hole -- early evolution phase (2007)
Sekiguchi, Yuichiro, Shibata, Masaru
The latest studies of massive star evolution indicate that an initially rapidly rotating star with sufficiently low metallicity can produce a rapidly rotating, massive stellar core that could be a...
The Final Fate of Binary Neutron Stars: What Happens After the Merger? (2007)
Duez, Matthew D., Liu, Yuk Tung, Shapiro, Stuart L., Shibata, Masaru, Stephens, Branson C.
The merger of two neutron stars usually produces a remnant with a mass significantly above the single (nonrotating) neutron star maximum mass. In some cases, the remnant will be stabilized against...
Merger of black hole-neutron star binaries: nonspinning black hole case (2006)
We perform a simulation for merger of a black hole (BH)-neutron star (NS) binary in full general relativity preparing a quasicircular state as initial condition. The BH is modeled by a moving...
Merger of black hole-neutron star binaries in full general relativity (2006)
We present our latest results for simulation for merger of black hole (BH)-neutron star (NS) binaries in full general relativity which is performed preparing a quasicircular state as initial...
Shibata, Masaru, Liu, Yuk Tung, Shapiro, Stuart L., Stephens, Branson C.
We study magnetohydrodynamic (MHD) effects arising in the collapse of magnetized, rotating, massive stellar cores to proto-neutron stars (PNSs). We perform axisymmetric numerical simulations in full...
Yoshino, Hirotaka, Shiromizu, Tetsuya, Shibata, Masaru
Scenarios of large extra dimensions have enhanced the importance for the study of black holes in higher dimensions. In this paper, we analyze an axisymmetric system of two black holes. Specifically,...
Collapse and black hole formation in magnetized, differentially rotating neutron stars (2006)
Stephens, Branson C., Duez, Matthew D., Liu, Yuk Tung, Shapiro, Stuart L., Shibata, Masaru
The capacity to model magnetohydrodynamical (MHD) flows in dynamical, strongly curved spacetimes significantly extends the reach of numerical relativity in addressing many problems at the forefront...
Duez, Matthew D., Liu, Yuk Tung, Shapiro, Stuart L., Shibata, Masaru, Stephens, Branson C.
We study the effects of magnetic fields on the evolution of differentially rotating neutron stars, which can form in stellar core collapse or binary neutron star coalescence. Magnetic braking and the...
Shibata, Masaru, Taniguchi, Keisuke
Three-dimensional simulations for the merger of binary neutron stars (BNSs) are performed in the framework of full general relativity. We pay particular attention to the black hole (BH) formation...
Joint LIGO and TAMA300 search for gravitational waves from inspiralling neutron star binaries (2006)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, Juri, Ajith, P., ...
We search for coincident gravitational wave signals from inspiralling neutron star binaries using LIGO and TAMA300 data taken during early 2003. Using a simple trigger exchange method, we perform an...
Akutsu, Tomomi, Akutsu, Tomotadu, Ando, Masaki, Arai, Koji, Araya, Akito, Asada, H., ...
We analyze the data of the TAMA300 detector to search for gravitational waves from inspiraling compact star binaries with masses of the component stars in the range 1M[sun]–3M[sun]. In this...
The Japanese space gravitational wave antenna - DECIGO (2006)
Kawamura, Seiji, Nakamura, T., Ando, M., Seto, N., Tsubono, K., Numata, K., ...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational wave antenna. It aims at detecting various kinds of gravitational waves between 1 mHz and...
Binary neutron stars: Equilibrium models beyond spatial conformal flatness (2005)
Uryu, Koji, Limousin, Francois, Friedman, John L., Gourgoulhon, Eric, Shibata, Masaru
Equilibria of binary neutron stars in close circular orbits are computed numerically in a waveless formulation: The full Einstein-relativistic-Euler system is solved on an initial hypersurface to...
Magnetized hypermassive neutron star collapse: a central engine for short gamma-ray bursts (2005)
Shibata, Masaru, Duez, Matthew D., Liu, Yuk Tung, Shapiro, Stuart L., Stephens, Branson C.
A hypermassive neutron star (HMNS) is a possible transient formed after the merger of a neutron star binary. In the latest magnetohydrodynamic simulations in full general relativity, we find that a...
Collapse of magnetized hypermassive neutron stars in general relativity (2005)
Duez, Matthew D., Liu, Yuk Tung, Shapiro, Stuart L., Shibata, Masaru, Stephens, Branson C.
Hypermassive neutron stars (HMNSs) -- equilibrium configurations supported against collapse by rapid differential rotation -- are possible transient remnants of binary neutron star mergers. Using...
Yoshino, Hirotaka, Shiromizu, Tetsuya, Shibata, Masaru
Motivated by the TeV-scale gravity scenarios, we study gravitational radiation in the head-on collision of two black holes in higher dimensional spacetimes using a close-limit approximation. We...
Shibata, Masaru, Font, José A.
A recent paper by Lucas-Serrano et al. indicates that a high-resolution central (HRC) scheme is robust enough to yield accurate hydrodynamical simulations of special relativistic flows in the...
Magnetohydrodynamics in full general relativity: Formulation and tests (2005)
Shibata, Masaru, Sekiguchi, Yu-ichiou
A new implementation for magnetohydrodynamics (MHD) simulations in full general relativity (involving dynamical spacetimes) is presented. In our implementation, Einstein's evolution equations are...
Sekiguchi, Yu-ichirou, Shibata, Masaru
We perform axisymmetric simulations for gravitational collapse of a massive iron core to a black hole in full general relativity. The iron cores are modeled by $\Gamma = 4/3$ equilibrium polytrope...
Latest general relativistic simulations for merger of binary neutron stars with realistic equations of state (EOSs) show that a hypermassive neutron star of an ellipsoidal figure is formed after the...
Merger of binary neutron stars with realistic equations of state in full general relativity (2005)
Shibata, Masaru, Taniguchi, Keisuke, Uryu, Koji
We present numerical results of three-dimensional simulations for the merger of binary neutron stars (BNSs) in full general relativity. Hybrid equations of state (EOSs) are adopted to mimic realistic...
Black hole tidal problem in the Fermi normal coordinates (2005)
Ishii, Masaki, Shibata, Masaru, Mino, Yasushi
We derive a tidal potential for a self-gravitating fluid star orbiting Kerr black hole along a timelike geodesic extending previous works by Fishbone and Marck. In this paper, the tidal potential is...
Upper limits from the LIGO and TAMA detectors on the rate of gravitational-wave bursts (2005)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, Juri, Ajith, P., ...
Ando, M., Arai, K., Aso, Y., Beyersdorf, P. T., Hayama, K., Iida, Y., ...
Shibata, Masaru, Sekiguchi, Yu-ichirou
We perform fully general relativistic simulations of rotating stellar core collapse in three spatial dimension. A parametric equation of state is adopted following Dimmelmeier et al. The early stage...
Shibata, Masaru, Karino, Sigeyuki
The evolution of a nonaxisymmetric bar-mode perturbation of rapidly rotating stars due to a secular instability induced by gravitational wave emission is studied in post-Newtonian simulations taking...
Shibata, Masaru, Uryu, Koji, Friedman, John L.
Two relations, the virial relation $M_{\rm ADM}=M_{\rm K}$ and the first law in the form $\delta M_{\rm ADM}=\Omega \delta J$, should be satisfied by a solution and a sequence of solutions describing...
New criterion for direct black hole formation in rapidly rotating stellar collapse (2004)
Sekiguchi, Yu-ichirou, Shibata, Masaru
We study gravitational collapse of rapidly rotating relativistic polytropes of the adiabatic index $\Gamma = 1.5$ and 2, in which the spin parameter $q \equiv J/M^{2} > 1$ where $J$ and $M$ are total...
We study secular stability against a quasi-radial oscillation for rigidly rotating stars with soft equations of state in general relativity. The polytropic equations of state with polytropic index...
Shibata, Masaru, Sekiguchi, Yuichirou
Gravitational waves from oscillating neutron stars in axial symmetry are studied performing numerical simulations in full general relativity. Neutron stars are modeled by a polytropic equation of...
Shibata, Masaru, Sekiguchi, Yu-ichirou
Axisymmetric numerical simulations of rotating stellar core collapse to a neutron star are performed in the framework of full general relativity. The so-called Cartoon method, in which the Einstein...
Shibata, Masaru, Tsuyama, Michito, Takami, Tsuneaki, Shimizu, Hideyuki, Kobayashi, Yoshichika
The rice mutants M249 and M134 accumulate chlorophyllides a and b which are esterified with incompletely reduced alcohols such as geranylgeraniol, dihydrogeranylgeraniol, and...
Shibata, Masaru, Tsuyama, Michito, Takami, Tsuneaki, Shimizu, Hideyuki, Kobayashi, Yoshichika
The rice mutants M249 and M134 accumulate chlorophyllides a and b which are esterified with incompletely reduced alcohols such as geranylgeraniol, dihydrogeranylgeraniol, and...
Merger of binary neutron stars of unequal mass in full general relativity (2003)
Shibata, Masaru, Taniguchi, Keisuke, Uryu, Koji
We present results of three dimensional numerical simulations of the merger of unequal-mass binary neutron stars in full general relativity. A $\Gamma$-law equation of state...
We study the final state of the gravitational collapse of uniformly rotating supramassive neutron stars by axisymmetric simulations in full general relativity. The rotating stars provided as the...
Harada, Tomohiro, Iguchi, Hideo, Shibata, Masaru
Nonspherical stellar collapse to a black hole is one of the most promising gravitational wave sources for gravitational wave detectors. We numerically study gravitational waves from a slightly...
Shibata, Masaru, Karino, Shigeyuki, Eriguchi, Yoshiharu
As an extension of our previous work, we investigate the dynamical instability against nonaxisymmetric bar-mode deformations of differentially rotating stars in Newtonian gravity varying the...
We report a new implementation for axisymmetric simulation in full general relativity. In this implementation, the Einstein equations are solved using the Nakamura-Shibata formulation with the...
Merger of binary neutron stars of unequal mass in full general relativity (2003)
Shibata, Masaru, Taniguchi, Keisuke, Uryu, Koji
We present results of three dimensional numerical simulations of the merger of unequal-mass binary neutron stars in full general relativity. A $\Gamma$-law equation of state...
Shapiro, Stuart L., Shibata, Masaru
The collapse of a uniformaly rotating, supermassive star (SMS) to a supermassive black hole (SMBH) has been followed recently by means of hydrodynamic simulations in full general relativity. The...
Dynamical instability of differentially rotating stars (2002)
Shibata, Masaru, Karino, Shigeyuki, Eriguchi, Yoshiharu
We study the dynamical instability against bar-mode deformation of differentially rotating stars. We performed numerical simulation and linear perturbation analysis adopting polytropic equations of...
Shibata, Masaru, Shapiro, Stuart L.
We follow the collapse in axisymmetry of a uniformly rotating, supermassive star (SMS) to a supermassive black hole (SMBH) in full general relativity. The initial SMS of arbitrary mass $M$ is...
We performed 3D numerical simulations of the merger of equal-mass binary neutron stars in full general relativity using a new large scale supercomputer. We take the typical grid size as (505,505,253)...
Saijo, Motoyuki, Baumgarte, Thomas W., Shapiro, Stuart L., Shibata, Masaru
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 relativity. This problem is...
Saijo, Motoyuki, Baumgarte, Thomas W., Shapiro, Stuart L., Shibata, Masaru
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 relativity. This problem is...
Comparing the inspiral of irrotational and corotational binary neutron stars (2001)
Duez, Matthew D., Baumgarte, Thomas W., Shapiro, Stuart L., Shibata, Masaru, Uryu, Koji
We model the adiabatic inspiral of relativistic binary neutron stars in a quasi-equilibrium (QE) approximation, and compute the gravitational wavetrain from the late phase of the inspiral. We compare...
Gravitational waves from binary neutron stars in quasiequilibrium circular orbits are computed using an approximate method which we propose in this paper. In the first step of this method, we prepare...
Thermodynamics of binary black holes and neutron stars (2001)
Friedman, John L., Uryu, Koji, Shibata, Masaru
We consider compact binary systems, modeled in general relativity as vacuum or perfect-fluid spacetimes with a helical Killing vector k^\alpha, heuristically, the generator of time-translations in a...
Equilibrium and stability of supermassive stars in binary systems (2001)
Shibata, Masaru, Shapiro, Stuart L., Uryu, Koji
We investigate the equilibrium and stability of supermassive stars of mass $M \agt 10^5M_{\odot}$ in binary systems. We find that corotating binaries are secularly unstable for close, circular orbits...
Binary neutron star mergers in fully general relativistic simulations (2001)
We perform 3D numerical simulations for merger of equal mass binary neutron stars in full general relativity preparing irrotational binary neutron stars in a quasiequilibrium state as initial...
Dynamical Bar Instability in Relativistic Rotating Stars (2001)
Saijo, Motoyuki, Shibata, Masaru, Baumgarte, Thomas W., Shapiro, Stuart L.
We study by computational means the dynamical stability against bar-mode deformation of rapidly and differentially rotating stars in a post-Newtonian approximation of general relativity. We vary the...
Dynamical bar instability in rotating stars: effect of general relativity (2001)
Saijo, Motoyuki, Shibata, Masaru, Baumgarte, Thomas W., Shapiro, Stuart L.
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 the compaction of...
Black holes in the brane world: Time symmetric initial data (2000)
Shiromizu,Tetsuya, Shibata,Masaru
We numerically construct time-symmetric initial data sets of a black hole in the Randall-Sundrum brane world model, assuming that the black hole is spherical on the brane. We find that the apparent...
Dynamical Bar Instability in Rotating Stars: Effect of General Relativity (2000)
Saijo, Motoyuki, Shibata, Masaru, Baumgarte, Thomas W., Shapiro, Stuart L.
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 the compaction of...
Black holes in the brane world:Time symmetric initial data (2000)
Shiromizu, Tetsuya, Shibata, Masaru
We numerically construct time-symmetric initial data sets of a black hole in the Randall-Sundrum brane world model, assuming that the black hole is spherical on the brane. We find that the apparent...
Motivated by a recent paper by the Potsdam numerical relativity group, we have constructed a new numerical code for hydrodynamic simulation of axisymmetric systems in full general relativity. In this...
Uryu, Koji, Shibata, Masaru, Eriguchi, Yoshiharu
We investigate close binary neutron stars in quasiequilibrium states in a general relativistic framework. We assume conformal flatness for the spatial metric and irrotational velocity field for the...
Response of Interferometric Detectors to Scalar Gravitational Waves (2000)
Nakao, Ken-ichi, Harada, Tomohiro, Shibata, Masaru, Kawamura, Seiji, Nakamura, Takashi
We rigorously analyze the frequency response functions and antenna sensitivity patterns of three types of interferometric detectors to scalar mode of gravitational waves which is predicted to exist...
Shibata, Masaru, Baumgarte, Thomas W., Shapiro, Stuart L.
We study the dynamical stability against bar-mode deformation of rapidly spinning neutron stars with differential rotation. We perform fully relativistic 3D simulations of compact stars with $M/R...
Black holes in the brane world: Time symmetric initial data (2000)
Shiromizu, Tetsuya, Shibata, Masaru
We numerically construct time-symmetric initial data sets of a black hole in the Randall-Sundrum brane world model, assuming that the black hole is spherical on the brane. We find that the apparent...
Uryu, Koji, Shibata, Masaru, Eriguchi, Yoshiharu
We investigate close binary neutron stars in quasiequilibrium states in a general relativistic framework. We assume conformal flatness for the spatial metric and irrotational velocity field for the...
Simulation of merging binary neutron stars in full general relativity: $\Gamma=2$ case (2000)
We perform 3D numerical simulations for merger of equal mass binary neutron stars in full general relativity. We adopt a $\Gamma$-law equation of state in the form $P=(\Gamma-1)\rho\epsilon$ where P,...
Shibata, Masaru, Baumgarte, Thomas W., Shapiro, Stuart L.
We perform 3D numerical simulations in full general relativity to study the stability of rapidly rotating, supramassive neutron stars at the mass-shedding limit to dynamical collapse. We adopt an...
Simulation of merging binary neutron stars in full general relativity: $\Gamma=2$ case (1999)
We have performed 3D numerical simulations for merger of equal mass binary neutron stars in full general relativity. We adopt a $\Gamma$-law equation of state in the form $P=(\Gamma-1)\rho\epsilon$...
On the Maximum Mass of Differentially Rotating Neutron Stars (1999)
Baumgarte, Thomas W., Shapiro, Stuart L., Shibata, Masaru
We construct relativistic equilibrium models of differentially rotating neutron stars and show that they can support significantly more mass than their nonrotating or uniformly rotating counterparts....
Fully general relativistic simulation of coalescing binary neutron stars: Preparatory tests (1999)
We present our first successful numerical results of 3D general relativistic simulations in which the Einstein equation as well as the hydrodynamic equations are fully solved. This paper is...
Shibata, Masaru, Sasaki, Misao
We study formation of black holes in the Friedmann universe. We present a formulation of the Einstein equations under the constant mean curvature time-slicing condition. Our formalism not only gives...
We have carried out simulations of the coalescence between two relativistic clusters of collisionless particles using a 3D numerical relativity code. We have adopted a new spatial gauge condition...
Taniguchi, Keisuke, Asada, Hideki, Shibata, Masaru
First post-Newtonian (1PN) hydrostatic equations for an irrotational fluid which have been recently derived are solved for an incompressible star. The 1PN configurations are expressed as a...
Innermost stable circular orbits around relativistic rotating stars (1998)
Shibata, Masaru, Sasaki, Misao
We investigate the innermost stable circular orbit (ISCO) of a test particle moving on the equatorial plane around rotating relativistic stars such as neutron stars. First, we derive approximate...
Taniguchi, Keisuke, Shibata, Masaru
We analytically study gravitational radiation from corotating binary neutron stars composed of incompressible, homogeneous fluid in circular orbits. The energy and the angular momentum loss rates are...
We present relativistic hydrostatic equations for obtaining irrotational binary neutron stars in quasi equilibrium states in 3+1 formalism. Equations derived here are different from those previously...
Shibata, Masaru, Taniguchi, Keisuke, Nakamura, Takashi
In this paper, we present results obtained from our recent studies on the location of the innermost stable circular orbit (ISCO) for binary neutron stars (BNSs) in several levels of post Newtonian...
Black Hole Perturbation (1997)
Mino, Yasushi, Sasaki, Misao, Shibata, Masaru, Tagoshi, Hideyuki, Tanaka, Takahiro
We present analytic calculations of gravitational waves from a particle orbiting a black hole. We first review the Teukolsky formalism for dealing with the gravitational perturbation of a black hole....
Shibata, Masaru, Oohara, Ken-ichi, Nakamura, Takashi
We present numerical results on the hydrodynamic stability of coalescing binary stars in the first post Newtonian(1PN) approximation of general relativity. We pay particular attention to the...
Solving the Darwin problem in the first post-Newtonian approximation of general relativity (1997)
Taniguchi, Keisuke, Shibata, Masaru
We analytically calculate the equilibrium sequence of the corotating binary stars of incompressible fluid in the first post-Newtonian(PN) approximation of general relativity. By calculating the total...
Shibata, Masaru, Taniguchi, Keisuke
Using the ellipsoidal model for the density configuration, we calculate the equilibrium sequence of the corotating binary stars of the polytropic equation of state in the first post-Newtonian...
Asada, Hideki, Shibata, Masaru
We present a formalism to obtain equilibrium configurations of uniformly rotating fluid in the second post-Newtonian approximation of general relativity. In our formalism, we need to solve 29 Poisson...
Post-Newtonian Hydrodynamic Equations Using the (3+1) Formalism in General Relativity (1996)
Asada, Hideki, Shibata, Masaru, Futamase, Toshifumi
Using the (3+1) formalism in general relativity, we perform the post-Newtonian(PN) approximation to clarify what sort of gauge condition is suitable for numerical analysis of coalescing compact...
Tagoshi, Hideyuki, Shibata, Masaru, Tanaka, Takahiro, Sasaki, Misao
Extending a method developed by Sasaki in the Schwarzschild case and by Shibata, Sasaki, Tagoshi, and Tanaka in the Kerr case, we calculate the post-Newtonian expansion of the gravitational wave...
Gravitational waves from a spinning particle in circular orbits around a rotating black hole (1996)
Tanaka, Takahiro, Mino, Yasushi, Sasaki, Misao, Shibata, Masaru
Using the Teukolsky and Sasaki-Nakamura formalisms for the perterbations around a Kerr black hole, we calculate the energy flux of gravitational waves induced by a {\it spinning} particle of mass...
Hubble Parameter in Void Universe (1995)
Nakao, Ken-ichi, Gouda, Naoteru, Chiba, Takeshi, Ikeuchi, Satoru, Nakamura, Takashi, Shibata, Masaru
We investigate the distance-redshift relation in the simple void model. As discussed by Moffat and Tatarski, if the observer stays at the center of the void, the observed Hubble parameter is not so...
Shibata, Masaru, Sasaki, Misao, Tagoshi, Hideyuki, Tanaka, Takahiro
Using the Teukolsky and Sasaki-Nakamura equations for the gravitational perturbation of the Kerr spacetime, we calculate the post-Newtonian expansion of the energy and angular momentum luminosities...
Isolation of Chloroplast DNA from Pinus (1986)
Kondo, Teiji, Ishibashi, Takashi, Shibata, Masaru, Hirai, Atsushi
Chloroplast DNA isolated from Japanese black pine [Pinus thunbergii) was digested with three restriction endonucleases. The size of this DNA was estimated to be 120 kbp. Chloroplast DNA from Japanese...
The possibility of photo-induced induction of nitrate reductase in rice seedlings (1969)
SHIBATA, MASARU, KOBAYASHI, MICHIHARU, TAKAHASHI, EIICHI
Nitrate reductase activity in rice seedlings showed daily fluctuations. Seedlings placed in the dark slowly lost activity and quickly regained it when exposed to sunlight. Etiolated seedlings also...
Omatsu-Kanbe, Mariko, Shibata, Masaru, Yamamoto, Takefumi, Isono, Takahiro, Matsuura, Hiroshi
Stimulation of P2 receptors with micromolar concentration of ATP evokes a transient increase in [Ca2+]i (intracellular free Ca2+ concentration), primarily due to release of Ca2+ from intracellular...
Omatsu-Kanbe, Mariko, Shibata, Masaru, Yamamoto, Takefumi, Isono, Takahiro, Matsuura, Hiroshi
Stimulation of P2 receptors with micromolar concentration of ATP evokes a transient increase in [Ca2+]i (intracellular free Ca2+ concentration), primarily due to release of Ca2+ from intracellular...