Hisaaki Shinkai

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Name
Hisaaki Shinkai
E-mail
hisaaki.shinkaioit.ac.jp
URL
http://www.is.oit.ac.jp/~shinkai/
Affiliation
Osaka Institute of Technology
Section
Faculty of Information Science and Technology
Job title
Professor
Degree
Doctor of Science
Other affiliation
RIKENMukogawa Women's University
Research funding number
30267405
ORCID ID
0000-0003-1082-2844

Profile

Director of International Center, Osaka Institute of Technology

Research Areas

 
 

Academic & Professional Experience

 
Apr 1994
 - 
Oct 1996
Assistant Professor, Waseda University
 
Nov 1996
 - 
Jul 1999
Research Associate, Washington University (St. Louis, USA)
 
Aug 1999
 - 
Mar 2001
Visiting Researcher, Centre for Gravitational Physics and Geometry, The Pennsylvania State University
 
Apr 2001
 - 
Dec 2003
Special Post-doctoral Researcher, RIKEN
 
Jan 2004
 - 
Today
Visiting Researcher, RIKEN
 
Jan 2004
 - 
Jan 2006
Senior Scientist, Inamori Foundation
 
Apr 2006
 - 
Mar 2012
Associate Professor, Faculty of Information Science and Technology, Osaka Institute of Technology
 
Apr 2012
 - 
Today
Lecturer, Mukogawa Women's Univ.
 
Apr 2012
 - 
Today
Professor, Faculty of Information Science and Technology, Osaka Institute of Technology
 
Apr 2013
 - 
Mar 2017
Director, International Center, Osaka Institute of Technology
 

Education

 
Apr 1986
 - 
Mar 1990
Dept. of Physics, Faculty of Science and Technology, Waseda University
 
Apr 1990
 - 
Mar 1995
PhD course of Physics, Graduate School of Science and Technology, Waseda University
 

Awards & Honors

 
2000
"Classical and Quantum Gravity" Journal, one of Highlights
 
2001
Classical and Quantum Gravity" Journal, one of Highlights
 

Published Papers

 
Gravitational Wave and its Data Analysis
Hisaaki Shinkai
J. Institute of Systems, Control and Information Engineers   62(9) 370-375   Sep 2018   [Refereed]
SHINKAI Hisaaki
Prog. Theor. Exp. Phys.   013F01   Jan 2018   [Refereed]
Hisaaki Shinkai, Nobuyuki Kanda, Toshikazu Ebisuzaki
Astrophysical Journal   835 276   Feb 2017   [Refereed]
SHINKAI Hisaaki
Memoirs of Osaka Institute of Technology   61(2) 27-36   Jan 2017   [Refereed]
Takashi Torii, Hisaaki Shinkai
Physical Review D   88 064027   Sep 2013   [Refereed]
Takuya Tsuchiya, Gen Yoneda, Hisa-aki Shinkai
Physical Review D   85 044018   Feb 2012   [Refereed]
In order to obtain an evolution system which is robust against the violation
of constraints, we present a new set of evolution systems based on the
so-called Baumgarte-Shapiro-Shibata-Nakamura (BSSN) equations.The idea is to
add functional derivat...
Yuta Yamada, Hisa-aki Shinkai
Physical Review D   83(6) 064006   Mar 2011   [Refereed]
We numerically investigate the gravitational collapse of collisionless
particles in spheroidal configurations both in four and five-dimensional (5D)
space-time. We repeat the simulation performed by Shapiro and Teukolsky (1991)
that announced an a...
Takuya Tsuchiya, Gen Yoneda, Hisa-aki Shinkai
Physical Review D   83(6) 064032   Mar 2011   [Refereed]
With a purpose of constructing a robust evolution system against numerical
instability for integrating the Einstein equations, we propose a new
formulation by adjusting the ADM evolution equations with constraints. We apply
an adjusting method pro...
Tomoya Dode, Hisa-aki Shinkai
Memoirs of the Osaka Institute of Technology   A56(1) 1-18   2011   [Refereed]
Hayashi Masahito, Nakanishi Akira, Nakano Masahiro, Torii Takashi, Myo Takayuki, Nakamura Masahiko, Harada Yoshiyuki, Fujimoto Akira, Matsuoka Kazuo, Kotera Masatoshi, Nishiura Hiroyuki, Shinkai Hisa-aki, Tanaka Azuma
Memoirs of the Osaka Institute of Technology. Series A, Science & technology   54(2) 25-37   Feb 2010
Y. Yamada and H. Shinkai
Classical and Quantum Gravity   27 045012   2010   [Refereed]
Takashi Torii, Hisa-aki Shinkai
Physical Review D   78(8) 084037   Oct 2008   [Refereed]
Towards the investigation of the full dynamics in higher-dimensional and/or
stringy gravitational model, we present the basic equations of the
Einstein-Gauss-Bonnet gravity theory. We show Tex-dimensional version of
the ADM decomposition inclu...
Hideaki Kawazu, Hisa-aki Shinkai
Tenmon-Kyoiku   20(3) 45-51   May 2008   [Refereed]
Hisa-aki Shinkai
J.Korean Phys.Soc.   54(6,Pt.1) 2513-2528   May 2008   [Refereed]
We review recent efforts to re-formulate the Einstein equations for fully
relativistic numerical simulations. In order to complete a long-term and
accurate simulations of binary compact objects, people seek a robust set of
equations against the vi...
Kenta Kiuchi, Hisa-aki Shinkai
Physical Review D   77 044010   2008   [Refereed]
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, linear wave, and Gowdy-wave tests,
proposed by the Me...
with LIGO Scientific Collaboration, TAMA Collaboration
Physical Review D   73 102002-(10 pages)   2006   [Refereed]
TAMA Collaboration
Physical Review D   74 122002(8 pages)   2006   [Refereed]
Shinkai Hisaaki, Yoneda Gen
Bulletin of the Japan Society for Industrial and applied Mathematics   15(1) 2-15   Mar 2005   [Refereed]
We review recent efforts to re-formulate the Einstein equations for fully relativistic numerical simulations in general relativity. The so-called "numerical relativity" is a promising research field matching with ongoing astrophysical observations...
LIGO Scientific Collaboration, TAMA Collaboration
Physical Review D   72 122004 (16 pages)   2005   [Refereed]
TAMA collaboration
Physical Review D   71 082002 (17 pages)   2005   [Refereed]
Hisa-aki Shinkai, Gen Yoneda
General Relativity and Gravitation   36 1931-1937   Feb 2004   [Refereed]
Higher dimensional space-time models provide us an alternative interpretation
of nature, and give us different dynamical aspects than the traditional
four-dimensional space-time models. Motivated by such recent interests,
especially for future num...
Gravitational radiation from mergers of intermediate-mass black-holes
T. Matsubayashi, H. Shinkai, and T. Ebisuzaki
Astrophysical Journal   614 864-868   2004   [Refereed]
M. Alcubierre, G. Allen, C. Bona, D. Fiske, T. Goodale, F.S. Guzman, I. Hawke, S. Hawley, S. Husa, M. Koppitz, C. Lechner, D. Pollney, D. Rideout, E. Schnetter, E. Seidel, H. Shinkai, D. Shoemaker, B. Szilagyi, R. Takahashi, and J. Winicour
Classical and Quantum Gravity   21(2) 589-613   2004   [Refereed]
Gen Yoneda, Hisa-aki Shinkai
Classical and Quantum Gravity   20(4) L31-L36   2003   [Refereed]
In order to obtain stable and accurate general relativistic simulations,
re-formulations of the Einstein equations are necessary. In a series of our
works, we have proposed using eigenvalue analysis of constraint propagation
equations for evaluati...
Hisa-aki Shinkai, Sean A. Hayward
Physical Review D   66 044005   May 2002   [Refereed]
We study numerically the stability of Morris & Thorne's first traversible
wormhole, shown previously by Ellis to be a solution for a massless ghost
Klein-Gordon field. Our code uses a dual-null formulation for spherically
symmetric space-time inte...
Gen Yoneda, Hisa-aki Shinkai
Physical Review D   66 124003   Apr 2002   [Refereed]
Several numerical relativity groups are using a modified ADM formulation for
their simulations, which was developed by Nakamura et al (and widely cited as
Baumgarte-Shapiro-Shibata-Nakamura system). This so-called BSSN formulation is
shown to be m...
Hisa-aki Shinkai, Gen Yoneda
Classical and Quantum Gravity   19(6) 1027-1049   2002   [Refereed]
In order to find a way to have a better formulation for numerical evolution
of the Einstein equations, we study the propagation equations of the
constraints based on the Arnowitt-Deser-Misner formulation. By adjusting
constraint terms in the evolu...
Gen Yoneda, Hisa-aki Shinkai
Physical Review D   63 124019   Mar 2001   [Refereed]
The current important issue in numerical relativity is to determine which
formulation of the Einstein equations provides us with stable and accurate
simulations. Based on our previous work on "asymptotically constrained"
systems, we here present c...
Andrew Chamblin, Harvey S. Reall, Hisa-aki Shinkai, Tetsuya Shiromizu
Physical Review D   63 064015   2001   [Refereed]
We study charged brane-world black holes in the model of Randall and Sundrum
in which our universe is viewed as a domain wall in asymptotically anti-de
Sitter space. Such black holes can carry two types of ``charge'', one arising
from the bulk Wey...
Hisa-aki Shinkai, Sean A. Hayward
Physical Review D   64 044002   2001   [Refereed]
We numerically implement a quasi-spherical approximation scheme for computing
gravitational waveforms for coalescing black holes, testing it against angular
momentum by applying it to Kerr black holes. As error measures, we take the
conformal stra...
Gen Yoneda, Hisa-aki Shinkai
Results of the search for inspiraling compact star binaries from TAMA300's observation in 2000-2004   18(3) 441-462   2001   [Refereed]
We study asymptotically constrained systems for numerical integration of the
Einstein equations, which are intended to be robust against perturbative errors
for the free evolution of the initial data. First, we examine the previously
proposed "$\l...
Hisa-aki Shinkai, Gen Yoneda
Classical and Quantum Gravity   17(23) 4799-4822   2000   [Refereed]
In order to perform accurate and stable long-time numerical integration of
the Einstein equation, several hyperbolic systems have been proposed. We here
present numerical comparisons between weakly hyperbolic, strongly hyperbolic,
and symmetric hy...
Hisa-aki Shinkai, Tetsuya Shiromizu
Physical Review D   62 021010   2000   [Refereed]
We numerically study classical time evolutions of Kaluza-Klein bubble
space-time which has negative energy after a decay of vacuum. As the zero
energy Witten's bubble space-time, where the bubble expands infinitely, the
subsequent evolutions of Br...
Hisa-aki Shinkai, Gen Yoneda
Physical Review D   60 101502   1999   [Refereed]
We present a set of dynamical equations based on Ashtekar's extension of the
Einstein equation. The system forces the space-time to evolve to the manifold
that satisfies the constraint equations or the reality conditions or both as
the attractor a...
Gen Yoneda, Hisa-aki Shinkai
Int. J. Modern Physics D   9 13-34   Jan 1999   [Refereed]
Hyperbolic formulations of the equations of motion are essential technique
for proving the well-posedness of the Cauchy problem of a system, and are also
helpful for implementing stable long time evolution in numerical applications.
We, here, pres...
Hisa-aki Shinkai
Physical Review D   60 067504   1999   [Refereed]
As a preliminary step towards simulating binary neutron star coalescing
problem, we test a post-Newtonian approach by constructing a single neutron
star model. We expand the Tolman-Oppenheimer-Volkov equation of hydrostatic
equilibrium by the powe...
Gen Yoneda, Hisa-aki Shinkai
Physical Review Letters   82(2) 263-266   1999   [Refereed]
We present a first-order symmetric hyperbolic system in the Ashtekar
formulation of general relativity for vacuum spacetime. We add terms from
constraint equations to the evolution equations with appropriate combinations,
which is the same techniq...
Jayashree Balakrishna, Hisa-aki Shinkai
Physical Review D   58 044016   1997   [Refereed]
We study the dynamics of a self-gravitating scalar field solitonic object
(boson star) in the Jordan-Brans-Dicke (BD) theory of gravity. We show
dynamical processes of this system such as (i) black hole formation of
perturbed equilibrium configura...
G. L. Comer, Hisa-aki Shinkai
Classical and Quantum Gravity   15(3) 669-688   1998   [Refereed]
Boson stars in zero-, one-, and two-node equilibrium states are modeled
numerically within the framework of Scalar-Tensor Gravity. The complex scalar
field is taken to be both massive and self-interacting. Configurations are
formed in the case of ...
Gen Yoneda, Hisaaki Shinkai, Akika Nakamichi
Physical Review D   56(4) 2086-2093   1997   [Refereed]
We examine one of the advantages of Ashtekar's formulation of general
relativity: a tractability of degenerate points from the point of view of
following the dynamics of classical spacetime. Assuming that all dynamical
variables are finite, we con...
Motoyuki Saijo, Hisa-aki Shinkai, Kei-ichi Maeda
Physical Review D   56(2) 785-797   1997   [Refereed]
Analyzing test particles falling into a Kerr black hole, we study
gravitational waves in Brans-Dicke theory of gravity. First we consider a test
particle plunging with a constant azimuthal angle into a rotating black hole
and calculate the wavefor...
Gen Yoneda, Hisaaki Shinkai
Classical and Quantum Gravity   13(4) 783-790   1996   [Refereed]
We show how to treat the constraints and reality conditions in the
Tex-ADM (Ashtekar) formulation of general relativity, for the case of a
vacuum spacetime with a cosmological constant. We clarify the difference
between the reality conditions ...
Nobuyuki Sakai, Hisa-aki Shinkai, Takashi Tachizawa, Kei-ichi Maeda
Phys.Rev.D53:655,1996; Erratum-ibid.D54:2981,1996   53(2) 655-661   1995   [Refereed]
We study the dynamics of topological defects in the context of ``topological
inflation" proposed by Vilenkin and Linde independently. Analysing the time
evolution of planar domain walls and of global monopoles, we find that the
defects undergo inf...
Laurens Gunnarsen, Hisa-aki Shinkai, Kei-ichi Maeda
Classical and Quantum Gravity   12(1) 133-140   Jun 1994   [Refereed]
We present a new method for finding principal null directions (PNDs). Because
our method assumes as input the intrinsic metric and extrinsic curvature of a
spacelike hypersurface, it should be particularly useful to numerical
relativists. We illus...
Hisa-aki SHINKAI, Kei-ichi MAEDA
Physical Review D   49(12) 6367-6378   Feb 1994   [Refereed]
We study a generality of an inflationary scenario by integrating the Einstein
equations numerically in a plane-symmetric spacetime. We consider the
inhomogeneous spacetimes due to (i) localized gravitational waves with a
positive cosmological cons...
Hisa-aki SHINKAI, Kei-ichi MAEDA
Physical Review D   48(8) 3910-3913   May 1993   [Refereed]
To investigate the cosmic no hair conjecture, we analyze numerically
1-dimensional plane symmetrical inhomogeneities due to gravitational waves in
vacuum spacetimes with a positive cosmological constant. Assuming periodic
gravitational pulse waves...
J.R.Heringa, H.Shinkai, H.W.J.Bloete, A.Hoogland and R.K.P.Zia
Physical Review B   45(10) 5707-5709   1992   [Refereed]
Physical Review B45 (1992) 5707-5709   

Misc

 
"Science Skills" of University Students from the Viewpoint of High School/University Connection -- Results of Science Literacy Test
SHINKAI Hisaaki
Trends in the Sciences   22(1) 62-66   Jan 2017   [Refereed][Invited]

Books etc

 
Frontiers of Physics: Relativity, Quantum Theory, and Cosmlogy
Hisaaki Shinkai
Kyoritsu Shuppan   Sep 2018   ISBN:978-4-320-03605-5
How to build a Universe
Ben Gilliland, (tr. by H.Shinkai, T.Torii) (Part:Joint Translation)
Maruzen Corp.   Dec 2016   ISBN:978-4-621-30050-3
Physics answers to 'Why' in your daily life
Hisaaki Shinkai
Morikita Pub.   Oct 2015   ISBN:978-4-627-15611-1
Black hole, Expanding Universe, and Gravitational Wave
SHINKAI Hisaaki
Sep 2015   ISBN:978-4-334-03877-8
Calculus with Applications: A Structured Approach Second Edition
Hisaaki Shinkai
Kyoritsu Shuppan Co Ltd   Dec 2013   ISBN:978-4-320-11060-1
Probability and Statistics with Applications: A Structured Approach
Hisaaki Shinkai
Kyoritsu Publishing Co.   Mar 2012   ISBN:978-4-320-11009-0
Time Machine and Science of Space-time
Hisaaki Shinkai
Natsume Publishing Co.   Feb 2011   ISBN:978-4-816-35025-2
Ordinary Differential Equations with Applications: A Structured Approach
Hisaaki Shinkai
Kyoritsu Publishing Co.   Aug 2010   ISBN:978-4-320-01936-2
Calculus with Applications: A Structured Approach
Hisaaki Shinkai
Kyoritsu Publishing Co.   Apr 2009   ISBN:978-4-320-01879-2

Conference Activities & Talks

 
Hierarchical growth model of Super-Massive Black Hole and Gravitational Wave
Hisaaki Shinkai
Astronomy Society of Japan 2018 Fall   21 Sep 2018   
Auto-Regressive model for Gravitational Wave Analysis: Detection of Ring-dowm modes
Hisaaki Shinkai, Shun Yamamoto
Japan Physical Society 2018 Fall   14 Sep 2018   
Nonlinear Dynamics in the Einstein-Gauss-Bonnet gravity
Hisaaki Shinkai
Fifteenth Marcel Grossmann Meeting - MG15, Rome, Italy   3 Jul 2018   
Autoregressive Approach to Extract Ring-down Gravitational Wave of Black-hole Merger
Hisaaki Shinkai
Fifteenth Marcel Grossmann Meeting - MG15, Rome Italy   3 Jul 2018   
Gravitational-wave detector using optical lattice clocks in space
Hisaaki Shinkai
Fifteenth Marcel Grossmann Meeting - MG15, Rome, Italy   3 Jul 2018   
Proposal of Detection Method of Gravitational Wave using Optical Lattice Clocks
Hisaaki Shinkai, Toru Tamagawa, Atsushi Noda, Jun'ichiro Makino, Hidetoshi Katori, Toshikazu Ebisuzaki
Japan Physical Society Meeting 2018 Spring   25 Mar 2018   
Intermediate-mass black holes as sources of gravitational waves
Hisaaki Shinkai
International Symposium on Cosmology and Particle Astrophysics CosPA 2017, Kyoto Univ.   11 Dec 2017   
Event rates of gravitational waves in space-borne detectors based on a hierarchical growth model of SMBHs
Hisaaki Shinkai
The 27th Workshop on General Relativity and Gravitation in Japan - JGRG27, Hiroshima Univ.   27 Nov 2017   
Analysis of ringdown waveform using Auto-Regressive model
Shun Yamamoto, Hisaaki Shinkai
The 27th Workshop on General Relativity and Gravitation in Japan - JGRG27, Hiroshima Univ.   27 Nov 2017   
Nonlinear dynamics in Einstein-Gauss-Bonnet gravity
Hisaaki Shinkai
European Einstein Toolkit Workshop 2017, Mallorca, Spain   11 Oct 2017   
IMBH mergers and GW observations
Hisaaki Shinkai, Toshikazu Ebisuzaki
Japan Physical Society Meeting 2017 Fall   15 Sep 2017   
Gravitational Wave [Invited]
Hisaaki Shinkai
7 Aug 2017   
Nonlinear dynamics in Einstein-Gauss-Bonnet gravity
Hisaaki Shinkai, Takashi Torii
The 13th International Conference on Gravitation, Astrophysics, and Cosmology (ICGAC-XIII), Seoul, Korea   6 Jul 2017   
Gravitational waves from merging intermediate-mass black holes
Hisaaki Shinkai
The 13th International Conference on Gravitation, Astrophysics, and Cosmology (ICGAC-XIII), Seoul, Korea   4 Jul 2017   
Singularity Avoidance of Gauss-Bonnet gravity
Hisaaki Shinkai
The 26th Workshop on General Relativity and Gravitation in Japan (Hiroshima University)   24 Oct 2016   
Gravitational waves from merging intermediate-mass black-holes
Hisaaki Shinkai
The 26th Workshop on General Relativity and Gravitation in Japan (Hiroshima Univ.)   24 Oct 2016   
SMBH formation scenario and GW observation
Hisaaki Shinkai, Nobuyuki Kanda, Toshikazu Ebisuzaki
Astronomical Society of Japan, 2016 Fall Meeting   15 Sep 2016   
Formation Scenario of SMBH and Gravitational Wave
Hisaaki Shinkai, Nobuyuki Kanda, Toshikazu Ebisuzaki
The First International Meeting on KAGRA (KAIST, Daejeon, Korea)   25 Jun 2016   
Dynamics of n-dimensional Gauss-Bonnet gravity II
Hisaaki Shinkai, Takashi Torii
Japan Physical Society, 2016 Spring Meeting   20 Mar 2016   
On Textbooks I wrote [Invited]
Hisaaki Shinkai
Astronomical Society of Japan, 2016 Spring Meeting   15 Mar 2016   
Singularity Formation in n-dim Gauss-Bonnet gravity
Hisaaki Shinkai, Takashi Torii
JGRG25: The 25th Workshop on General Relativity and Gravitation in Japan (YITP, Kyoto Univ.)   7 Dec 2015   
Gravitational Wave Physics and Astronomy Workshop (GWPAW) 2015 (Osaka)
H. Shinkai, N. Kanda, T. Ebisuzaki
Can we distinguish formation models of a super-massive black-hole?   17 Jun 2015   
Dynamics in n-dimensional Gauss-Bonnet gravity
Hisaaki Shinkai, Takashi Torii
Japan Physical Society, 2015 Spring Meeting   Mar 2015   
Topological wormholes and their stability
Takashi Torii, Hisaaki Shinkai
Japan Physical Society, 2015 Spring Meeting   Mar 2015   
Wormhole Evolutions in n-dim Gauss-Bonnet gravity
Hisaaki Shinkai, Takashi Torii
JGRG24: The 24rd Workshop on General Relativity and Gravitation in Japan (IMPU, Tokyo Univ.)   10 Nov 2014   
Wormhole dynamics in higher-dimensional space-time
Hisaaki Shinkai, Takashi Torii
Spanish Relativity Meeting 2014 (Valencia, Spain)   1 Sep 2014   
Wormhole Dynamics
H.Shinkai and T.Torii
International Conference on Mathematical Modeling in Physical Sciences (Madrid, Spain)   30 Aug 2014   
Stability of wormholes in higher dimensional spacetime
Takashi Torii, Hisaaki Shinkai
Japan Physical Society, 2014 Spring Meeting   Mar 2014   
Wormholes in higher dimensional space-time: Dynamics
Hisaaki Shinkai
JGRG23: The 23rd Workshop on General Relativity and Gravitation in Japan (Hirosaki Univ.)   Nov 2013   
Wormhole dynamics in higher-dimensional space-time
Hisaaki Shinkai
The 20th International Conference on General Relativity and Gravitation (Warsaw, Poland)   Jul 2013   
Wormhole dynamics in Gauss-Bonnet gravity
Hisaaki Shinkai, Takashi Torii
Japan Physical Society, 2013 Spring Meeting   Mar 2013   
Numerical Study of Five-dimensional Gravitational Collapses
Yuta Yamada, Hisaaki Shinkai
RESCEU Symposium On General Relativity and Gravitation (JGRG22)   Nov 2012   
Numerical Study of 5-dimensional Gravitational Collapses
Yuta Yamada, Hisaaki Shinkai
The 13th Marcel Grossmann Meeting (Stockholm, Sweden, July 2012)   Jul 2012   
Wormhole evolutions in higher-dimensional gravity
Hisaaki Shinkai, Takashi Torii
RESCEU Symposium On General Relativity and Gravitation (JGRG22)   Nov 2012   
Wormhole Dynamics in Gauss-Bonnet gravity [Invited]
Hisaaki Shinkai
The workshop on theories and possibilities of observations of wormholes   Oct 2012   
Gravitational Collapse in 5-dimensional spacetie
Yuta Yamada Hisaaki Shinkai
Japan Physical Society, 2012 Spring Meeting   Mar 2012   
Constraint propagation and constraint-damping in the C2-adjusted formulation
Takuya Tsuchiya, Gen Yoneda, Hisaaki Shinkai
The 21st workshop on General Relativity and Gravitation in Japan (JGRG21) Tohoku Univ.   26 Sep 2011   
Gravitational collapse of ring objects in five-dimensional space-time
Yuta Yamada, Hisaaki Shinkai
The 21st workshop on General Relativity and Gravitation in Japan (JGRG21) Tohoku Univ.   26 Sep 2011   
Five-dimensional Black Ring and Hoop Conjecture
Yuta Yamada, Hisaaki Shinkai
Japan Physical Society, 2011 Fall Meeting   Sep 2011   
Numerical Investigations of Five-dimensional Gravitational Collapses [Invited]
Hisaaki Shinkai
2011 Shanghai Asia-Pacific School and Workshop on Gravitation (Shanghai, Feb. 2011)   Feb 2011   
Gravitational collapse in five dimensional space-time
Yuta Yamada, Hisaaki Shinkai
JGRG20: The 20th Workshop on General Relativity and Gravitation in Japan (Kyoto Univ.)   Sep 2010   
Dynamical Evolution of Five-Dimensional Black Ring
Yuta Yamada, Hisaaki Shinkai
Japan Physical Society, 2010 Spring Meeting   Mar 2010   
Yuta Yamada, Hisa-aki Shinkai
15 Jul 2009   
We numerically investigated the sequences of initial data of thin spindle and
thin ring in five-dimensional space-time in the context of the cosmic
censorship conjecture. We modeled the matter in non-rotating homogeneous
spheroidal or toroidal con...
Hisa-aki Shinkai, Gen Yoneda
30 Sep 2002   
We review recent efforts to re-formulate the Einstein equations for fully
relativistic numerical simulations. The so-called numerical relativity
(computational simulations in general relativity) is a promising research field
matching with ongoing ...
Hisa-aki Shinkai, Gen Yoneda
10 Mar 2001   
In order to perform accurate and stable long-term numerical integration of
the Einstein equations, several hyperbolic systems have been proposed. We here
report our numerical comparisons between weakly hyperbolic, strongly
hyperbolic, and symmetri...
Hisa-aki Shinkai, Wai-Mo Suen, F. Douglas Swesty, Malcolm Tobias, Edward Y. M. Wang, Clifford M. Will
15 Oct 1997   
We present two of our efforts directed toward the numerical analysis of
neutron star mergers, which are the most plausible sources for gravitational
wave detectors that should begin operating in the near future. First we present
Newtonian 3D simul...
Hisa-aki Shinkai, Gen Yoneda
15 Oct 1997   
We examine the advantages of the SO(3)-ADM (Ashtekar) formulation of general
relativity, from the point of following the dynamics of the Lorentzian
spacetime in direction of applying this into numerical relativity. We describe
our strategy how to ...

Research Grants & Projects

 
Project Year: Apr 2018 - Mar 2023    Investigator(s): Takashi Torii
MEXT: Grant-in-Aid for Scientific Research (C)
Project Year: Apr 2013 - Mar 2018    Investigator(s): Hisaaki Shinkai
MEXT: KAKENHI Kiban-C
Project Year: Apr 2010 - Mar 2014    Investigator(s): Hisaaki Shinkaii
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2004 - 2007    Investigator(s): Gen YONEDA
Numerical simulation of Einstein equation is essential for observation of gravitational wave and cosmology. But in real numerical simulation, especially in strong gravitational region or in very long time simulation, the violation of constraint of...

Social Contribution

 
Why and How we know there are blackholes
[Lecturer]  International School of Science Summer School  Aug 2016