兼担

理工学術院 先進理工学部
2022/01/22 更新
理工学術院 先進理工学部
素粒子、原子核、宇宙線、宇宙物理にする理論 一般相対論
計算科学
宇宙物理学
Multidimensional Boltzmann Neutrino Transport Code in Full General Relativity for Corecollapse Simulations
Ryuichiro Akaho, Akira Harada, Hiroki Nagakura, Kohsuke Sumiyoshi, Wakana Iwakami, Hirotada Okawa, Shun Furusawa, Hideo Matsufuru, Shoichi Yamada
Astrophysical Journal 909 ( 2 ) 2021年03月
PostNewtonian KozaiLidov mechanism and its effect on cumulative shift of periastron time of binary pulsar
Haruka Suzuki, Priti Gupta, Hirotada Okawa, Kei Ichi Maeda
Monthly Notices of the Royal Astronomical Society 500 ( 2 ) 1645  1665 2021年01月
Simulations of the early postbounce phase of corecollapse supernovae in threedimensional space with full boltzmann neutrino transport
Wakana Iwakami, Hirotada Okawa, Hiroki Nagakura, Akira Harada, Shun Furusawa, Kosuke Sumiyoshi, Hideo Matsufuru, Shoichi Yamada
Astrophysical Journal 903 ( 2 ) 2020年11月
The Boltzmannradiationhydrodynamics Simulations of Corecollapse Supernovae with Different Equations of State: The Role of Nuclear Composition and the Behavior of Neutrinos
Akira Harada, Hiroki Nagakura, Wakana Iwakami, Hirotada Okawa, Shun Furusawa, Kohsuke Sumiyoshi, Hideo Matsufuru, Shoichi Yamada
Astrophysical Journal 902 ( 2 ) 2020年10月
Threshold of primordial black hole formation in nonspherical collapse
Chul Moon Yoo, Tomohiro Harada, Hirotada Okawa
Physical Review D 102 ( 4 ) 2020年08月
Gravitational waves from hierarchical triple systems with KozaiLidov oscillation
Priti Gupta, Haruka Suzuki, Hirotada Okawa, Kei Ichi Maeda
Physical Review D 101 ( 10 ) 2020年05月 [査読有り]
Fast collective neutrino oscillations inside the neutrino sphere in corecollapse supernovae
M. Delfan Azari, S. Yamada, T. Morinaga, H. Nagakura, S.Furusawa, A. Harada, H. Okawa, W. Iwakami, K. Sumiyoshi
Physical Review D 2020年01月
Cumulative shift of periastron time of binary pulsar with Kozai–Lidov oscillation
Suzuki H, Gupta P, Okawa H, Maeda K.I
Monthly Notices of the Royal Astronomical Society: Letters 486 ( 1 ) L52  L57 2019年06月 [査読有り]
Linear analysis of fastpairwise collective neutrino oscillations in corecollapse supernovae based on the results of Boltzmann simulations
Milad Delfan Azari, Shoichi Yamada, Taiki Morinaga, Wakana Iwakami, Hirotada Okawa, Hiroki Nagakura, Kohsuke Sumiyoshi
Physical Review D 99 ( 10 ) 2019年05月 [査読有り]
Gravitational collapse of a massless scalar field in a periodic box
Chul Moon Yoo, Taishi Ikeda, Hirotada Okawa
Classical and Quantum Gravity 36 ( 7 ) 2019年03月 [査読有り]
Akira Harada, Hiroki Nagakura, Wakana Iwakami, Hirotada Okawa, Shun Furusawa, Hideo Matsufuru, Kohsuke Sumiyoshi, Shoichi Yamada
Astrophysical Journal 872 ( 2 ) 2019年 [査読有り]
Effects of Rotation and Magnetic Field on the Revival of a Stalled Shock in Supernova Explosions
Kotaro Fujisawa, Hirotada Okawa, Yu Yamamoto, Shoichi Yamada
Astrophysical Journal 872 ( 2 ) 2019年 [査読有り]
Akira Harada, Hiroki Nagakura, Wakana Iwakami, Hirotada Okawa, Shun Furusawa, Hideo Matsufuru, Kohsuke Sumiyoshi, Shoichi Yamada
2018年10月
Maximal efficiency of the collisional Penrose process with spinning particles
Kei Ichi Maeda, Kazumasa Okabayashi, Hirotada Okawa
Physical Review D 98 ( 6 ) 2018年09月 [査読有り]
Effects of rotation and magnetic field on the revival of a stalled shock in supernova explosions
Kotaro Fujisawa, Hirotada Okawa, Yu Yamamoto, Shoichi Yamada
2018年09月
The W4 method: a new multidimensional rootfinding scheme for nonlinear systems of equations
Hirotada Okawa, Kotaro Fujisawa, Yu Yamamoto, Ryosuke Hirai, Nobutoshi Yasutake, Hiroki Nagakura, Shoichi Yamada
2018年09月
Hiroki Nagakura, Wakana Iwakami, Shun Furusawa, Hirotada Okawa, Akira Harada, Kohsuke Sumiyoshi, Shoichi Yamada, Hideo Matsufuru, Akira Imakura
Astrophysical Journal 854 ( 2 ) 2018年02月 [査読有り]
Katsuki Aoki, Kei Ichi Maeda, Yosuke Misonoh, Hirotada Okawa
Physical Review D 97 ( 4 ) 2018年02月 [査読有り]
Hydrostatic Equilibria of Rotating Stars with Realistic Equation of State
Nobutoshi Yasutake, Kotaro Fujisawa, Hirotada Okawa, Shoichi Yamada
JPS Conf.Proc. 20 17pp 2018年 [査読有り]
Nonlinear collisional Penrose process: How much energy can a black hole release?
Ken Ichi Nakao, Hirotada Okawa, Kei Ichi Maeda
Progress of Theoretical and Experimental Physics 2018 ( 1 ) 2018年01月 [査読有り]
3D simulation of spindle gravitational collapse of a collisionless particle system
Chul Moon Yoo, Tomohiro Harada, Hirotada Okawa
Classical and Quantum Gravity 34 ( 10 ) 2017年04月 [査読有り]
Hyperbolic selfgravity solver for large scale hydrodynamical simulations
Ryosuke Hirai, Hiroki Nagakura, Hirotada Okawa, Kotaro Fujisawa
Physical Review D 93 ( 8 ) 2016年04月 [査読有り]
Interaction between bosonic dark matter and stars
Richard Brito, Vitor Cardoso, Caio F.B. Macedo, Hirotada Okawa, Carlos Palenzuela
Physical Review D 93 ( 4 ) 2016年02月 [査読有り]
Testing general relativity with present and future astrophysical observations
Emanuele Berti, Enrico Barausse, Vitor Cardoso, Leonardo Gualtieri, Paolo Pani, Ulrich Sperhake, Leo C. Stein, Norbert Wex, Kent Yagi, Tessa Baker, C. P. Burgess, Flávio S. Coelho, Daniela Doneva, Antonio De Felice, Pedro G. Ferreira, Paulo C.C. Freire, James Healy, Carlos Herdeiro, Michael Horbatsch, Burkhard Kleihaus, Antoine Klein, Kostas Kokkotas, Jutta Kunz, Pablo Laguna, Ryan N. Lang, Tjonnie G.F. Li, Tyson Littenberg, Andrew Matas, Saeed Mirshekari, Hirotada Okawa, Eugen Radu, Richard O'Shaughnessy, Bangalore S. Sathyaprakash, Chris Van Den Broeck, Hans A. Winther, Helvi Witek, Mir Emad Aghili, Justin Alsing, Brett Bolen, Luca Bombelli, Sarah Caudill, Liang Chen, Juan Carlos Degollado, Ryuichi Fujita, Caixia Gao, Davide Gerosa, Saeed Kamali, Hector O. Silva, João G. Rosa, Laleh Sadeghian, Marco Sampaio, Hajime Sotani, Miguel Zilhao
Classical and Quantum Gravity 32 ( 24 ) 2015年12月
Nonlinear evolutions of bosonic clouds around black holes
Hirotada Okawa
Classical and Quantum Gravity 32 ( 21 ) 2015年10月 [査読有り]
Accretion of Dark Matter by Stars
Richard Brito, Vitor Cardoso, Hirotada Okawa
Physical Review Letters 115 ( 11 ) 2015年09月 [査読有り]
Dynamical mass ejection from black holeneutron star binaries
Koutarou Kyutoku, Kunihito Ioka, Hirotada Okawa, Masaru Shibata, Keisuke Taniguchi
Physical Review D  Particles, Fields, Gravitation and Cosmology 92 ( 4 ) 2015年08月 [査読有り]
Evidence for event horizons: Longlived modes in ultracompact objects
Caio F.B. MacEdo, Luís C.B. Crispino, Vitor Cardoso, Hirotada Okawa, Paolo Pani
International Journal of Modern Physics D 24 ( 9 ) 2015年08月 [査読有り]
Dynamical mass ejection from black holeneutron star binaries
Koutarou Kyutoku, Kunihito Ioka, Hirotada Okawa, Masaru Shibata, Keisuke Taniguchi
PHYSICAL REVIEW D 92 ( 4 ) 2015年08月 [査読有り]
Kyohei Kawaguchi, Koutarou Kyutoku, Hiroyuki Nakano, Hirotada Okawa, Masaru Shibata, Keisuke Taniguchi
Physical Review D  Particles, Fields, Gravitation and Cosmology 92 ( 2 ) 2015年07月 [査読有り]
Black holeneutron star binary merger: Dependence on black hole spin orientation and equation of state
Kyohei Kawaguchi, Koutarou Kyutoku, Hiroyuki Nakano, Hirotada Okawa, Masaru Shibata, Keisuke Taniguchi
PHYSICAL REVIEW D 92 ( 2 ) 2015年07月 [査読有り]
Kenta Hotokezaka, Koutarou Kyutoku, Hirotada Okawa, Masaru Shibata
Physical Review D  Particles, Fields, Gravitation and Cosmology 91 ( 6 ) 2015年03月 [査読有り]
Exploring tidal effects of coalescing binary neutron stars in numerical relativity. II. Longterm simulations
Kenta Hotokezaka, Koutarou Kyutoku, Hirotada Okawa, Masaru Shibata
PHYSICAL REVIEW D 91 ( 6 ) 2015年03月 [査読有り]
Black holes and fundamental fields: Hair, kicks, and a gravitational Magnus effect
Hirotada Okawa, Vitor Cardoso
Physical Review D  Particles, Fields, Gravitation and Cosmology 90 ( 10 ) 2014年11月 [査読有り]
Study of the nonlinear instability of confined geometries
Hirotada Okawa, Vitor Cardoso, Paolo Pani
Physical Review D  Particles, Fields, Gravitation and Cosmology 90 ( 10 ) 2014年11月 [査読有り]
Higher dimensional numerical relativity: Code comparison
Helvi Witek, Hirotada Okawa, Vitor Cardoso, Leonardo Gualtieri, Carlos Herdeiro, Masaru Shibata, Ulrich Sperhake, Miguel Zilhão
Physical Review D  Particles, Fields, Gravitation and Cosmology 90 ( 8 ) 2014年10月 [査読有り]
Vitor Cardoso, Luís C.B. Crispino, Caio F.B. Macedo, Hirotada Okawa, Paolo Pani
Physical Review D  Particles, Fields, Gravitation and Cosmology 90 ( 4 ) 2014年08月 [査読有り]
Black hole universe with a cosmological constant
Chul Moon Yoo, Hirotada Okawa
Physical Review D  Particles, Fields, Gravitation and Cosmology 89 ( 12 ) 2014年06月 [査読有り]
Hirotada Okawa, Helvi Witek, Vitor Cardoso
Physical Review D  Particles, Fields, Gravitation and Cosmology 89 ( 10 ) 2014年05月 [査読有り]
Black holes and fundamental fields in numerical relativity: Initial data construction and evolution of bound states
Hirotada Okawa, Helvi Witek, Vitor Cardoso
PHYSICAL REVIEW D 89 ( 10 ) 2014年05月 [査読有り]
Coalescence of binary neutron stars in a scalartensor theory of gravity
Masaru Shibata, Keisuke Taniguchi, Hirotada Okawa, Alessandra Buonanno
Physical Review D  Particles, Fields, Gravitation and Cosmology 89 ( 8 ) 2014年04月 [査読有り]
Hirotada Okawa, Vitor Cardoso, Paolo Pani
Physical Review D  Particles, Fields, Gravitation and Cosmology 89 ( 4 ) 2014年02月 [査読有り]
An alternative numerical method for the stationary pulsar magnetosphere
Yohsuke Takamori, Hirotada Okawa, Makoto Takamoto, Yudai Suwa
Publications of the Astronomical Society of Japan 66 ( 1 ) 2014年 [査読有り]
Blackhole universe: Time evolution
Chul Moon Yoo, Hirotada Okawa, Ken Ichi Nakao
Physical Review Letters 111 ( 16 ) 2013年10月 [査読有り]
Hirotada Okawa
International Journal of Modern Physics A 28 ( 2223 ) 2013年09月 [査読有り]
Mass ejection from the merger of binary neutron stars
Kenta Hotokezaka, Kenta Kiuchi, Koutarou Kyutoku, Hirotada Okawa, Yu Ichiro Sekiguchi, Masaru Shibata, Keisuke Taniguchi
Physical Review D  Particles, Fields, Gravitation and Cosmology 87 ( 2 ) 2013年01月 [査読有り]
NR/HEP: Roadmap for the future
Vitor Cardoso, Leonardo Gualtieri, Carlos Herdeiro, Ulrich Sperhake, Paul M. Chesler, Luis Lehner, Seong Chan Park, Harvey S. Reall, Carlos F. Sopuerta, Daniela Alic, Oscar J.C. Dias, Roberto Emparan, Valeria Ferrari, Steven B. Giddings, Mahdi Godazgar, Ruth Gregory, Veronika E. Hubeny, Akihiro Ishibashi, Greg Landsberg, Carlos O. Lousto, David Mateos, Vicki Moeller, Hirotada Okawa, Paolo Pani, M. Andy Parker, Frans Pretorius, Masaru Shibata, Hajime Sotani, Toby Wiseman, Helvi Witek, Nicolas Yunes, Miguel Zilhão
Classical and Quantum Gravity 29 ( 24 ) 2012年12月 [査読有り]
Koutarou Kyutoku, Hirotada Okawa, Masaru Shibata, Keisuke Taniguchi
Physical Review D  Particles, Fields, Gravitation and Cosmology 84 ( 6 ) 2011年09月 [査読有り]
Gravitational waves from spinning black holeneutron star binaries: dependence on black hole spins and on neutron star equations of state
Koutarou Kyutoku, Hirotada Okawa, Masaru Shibata, Keisuke Taniguchi
PHYSICAL REVIEW D 84 ( 6 ) 2011年09月 [査読有り]
Binary neutron star mergers: Dependence on the nuclear equation of state
Kenta Hotokezaka, Koutarou Kyutoku, Hirotada Okawa, Masaru Shibata, Kenta Kiuchi
Physical Review D  Particles, Fields, Gravitation and Cosmology 83 ( 12 ) 2011年06月 [査読有り]
Is superPlanckian physics visible? Scattering of black holes in 5 dimensions
Hirotada Okawa, Ken Ichi Nakao, Masaru Shibata
Physical Review D  Particles, Fields, Gravitation and Cosmology 83 ( 12 ) 2011年06月 [査読有り]
Highvelocity bh collision in 5 dimensions
Hirotada Okawa, Masaru Shibata
Proceedings of the 20th Workshop on General Relativity and Gravitation in Japan, JGRG 2010 425  427 2010年12月
Highvelocity bh collision in 5 dimensions
Hirotada Okawa, Masaru Shibata
Proceedings of the 20th Workshop on General Relativity and Gravitation in Japan, JGRG 2010 425  427 2010年 [査読有り]
Gravitational waves from spinning black holeneutron star binaries
Koutarou Kyutoku, Masaru Shibata, Hirotada Okawa, Keisuke Taniguchi
Proceedings of the 20th Workshop on General Relativity and Gravitation in Japan, JGRG 2010 254  257 2010年 [査読有り]
Highvelocity collision of two black holes
Masaru Shibata, Hirotada Okawa, Tetsuro Yamamoto
Physical Review D  Particles, Fields, Gravitation and Cosmology 78 ( 10 ) 2008年11月 [査読有り]