藤澤 幸太郎
| 教育推進機構 基礎・教養科（自然） | 准教授 |
経歴
- 2026年04月 - 現在
工学院大学, 教育推進機構 基礎・教養科, 准教授 - 2023年04月 - 2026年03月
東京工科大学 教養学環, 講師 - 2023年04月 - 2025年03月
東京大学 理学系研究科附属ビッグバン宇宙国際研究センター, 客員共同研究員 - 2022年03月 - 2023年03月
東京大学 理学系研究科物理学専攻 物理学教室, 特任助教 - 2019年04月 - 2022年02月
東京大学, 理学系研究科附属ビッグバン宇宙国際研究センター, 特任助教 - 2016年04月 - 2019年03月
早稲田大学, 理工学術院, 日本学術振興会特別研究員(PD) - 2014年04月 - 2016年03月
早稲田大学, 理工学術院, 次席研究員(研究院助教) - 2011年04月 - 2014年03月
東京大学, 教養学部, 日本学術振興会特別研究員(DC1)
学歴
ID各種
ID各種
研究者番号：30732408
researchmap会員ID：7000007506
J-Global ID：201401067189146995
論文
- Quantum algorithm for the Vlasov simulation of the large-scale structure formation with massive neutrinos
Koichi Miyamoto; Soichiro Yamazaki; Fumio Uchida; Kotaro Fujisawa; Naoki Yoshida
Physical Review Research, 2024年02月26日 - Equilibriums of extremely magnetized compact stars with force-free magnetotunnels
Kōji Uryū; Shijun Yoshida; Eric Gourgoulhon; Charalampos Markakis; Kotaro Fujisawa; Antonios Tsokaros; Keisuke Taniguchi; Mina Zamani
Physical Review D, 2023年05月09日 - Quantum algorithm for collisionless Boltzmann simulation of self-gravitating systems
Soichiro Yamazaki; Fumio Uchida; Kotaro Fujisawa; Naoki Yoshida
2023年03月29日 - A Lagrangian construction of rotating star models
Misa Ogata; Hirotada Okawa; Kotaro Fujisawa; Nobutoshi Yasutake; Yu Yamamoto; Shoichi Yamada
Monthly Notices of the Royal Astronomical Society, 2023年03月07日, ［査読有り］ - Evolutionary deformation toward the elastic limit by a magnetic field confined in the neutron--star crust
Yasufumi Kojima; Shota Kisaka; Kotaro Fujisawa
2023年03月04日 - A novel Lagrangian formulation to construct relativistic rotating stars: towards its application to their evolution calculations
Hirotada Okawa; Kotaro Fujisawa; Nobutoshi Yasutake; Misa Ogata; Yu Yamamoto; Shoichi Yamada
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2023年01月, ［査読有り］ - The W4 method: A new multi-dimensional root-finding scheme for nonlinear systems of equations
Hirotada Okawa; Kotaro Fujisawa; Yu Yamamoto; Ryosuke Hirai; Nobutoshi Yasutake; Hiroki Nagakura; Shoichi Yamada
Applied Numerical Mathematics, 2023年01月, ［査読有り］ - Strong toroidal magnetic fields sustained by the elastic crust in a neutron star
Kotaro Fujisawa; Yasufumi Kojima; Shota Kisaka
Monthly Notices of the Royal Astronomical Society, 2022年12月22日, ［査読有り］ - Modeling photometric variations due to a global inhomogeneity on an obliquely rotating star: Application to light curves of white dwarfs
Yasushi Suto; Shin Sasaki; Masataka Aizawa; Kotaro Fujisawa; Kazumi Kashiyama
Publications of the Astronomical Society of Japan, 2022年12月09日, ［査読有り］ - Self-similar Solution of Rotating Eruptive Outflows on Its Equatorial Plane
Takatoshi Ko; Kotaro Fujisawa; Toshikazu Shigeyama
The Astrophysical Journal, 2022年12月01日, ［査読有り］ - Magnetically confined mountains on accreting neutron stars with multipole magnetic fields
Kotaro Fujisawa; Kisaka Shota; Yasufumi Kojima
Monthly Notices of the Royal Astronomical Society, 2022年09月14日, ［査読有り］ - Fast optical flares from M dwarfs detected by a one-second-cadence survey with Tomo-e Gozen
Masataka Aizawa; Kojiro Kawana; Kazumi Kashiyama; Ryou Ohsawa; Hajime Kawahara; Fumihiro Naokawa; Tomoyuki Tajiri; Noriaki Arima; Hanchun Jiang; Tilman Hartwig; Kotaro Fujisawa; Toshikazu Shigeyama; Ko Arimatsu; Mamoru Doi; Toshihiro Kasuga; Naoto Kobayashi; Sohei Kondo; Yuki Mori; Shin-ichiro Okumura; Satoshi Takita; Shigeyuki Sako
Publications of the Astronomical Society of Japan, 2022年08月08日, ［査読有り］ - Singularity-Avoiding Multi-Dimensional Root-Finder
Hirotada Okawa; Kotaro Fujisawa; Yu Yamamoto; Nobutoshi Yasutake; Misa Ogata; Shoichi Yamada
arXiv:2204.09941, 2022年04月21日 - Magnetic field sustained by the elastic force in neutron star crusts
Yasufumi Kojima; Shota Kisaka; Kotaro Fujisawa
Monthly Notices of the Royal Astronomical Society, 2022年02月01日, ［査読有り］ - Magneto-elastic equilibrium of a neutron star crust
Yasufumi Kojima; Shota Kisaka; Kotaro Fujisawa
Monthly Notices of the Royal Astronomical Society, 2021年07月30日, ［査読有り］ - Evolution of magnetic deformation in neutron star crust
Yasufumi Kojima; Shota Kisaka; Kotaro Fujisawa
Monthly Notices of the Royal Astronomical Society, 2021年02月09日, ［査読有り］ - New code for equilibriums and quasiequilibrium initial data of compact objects. IV. Rotating relativistic stars with mixed poloidal and toroidal magnetic fields
Kōji Uryū; Shijun Yoshida; Eric Gourgoulhon; Charalampos Markakis; Kotaro Fujisawa; Antonios Tsokaros; Keisuke Taniguchi; Yoshiharu Eriguchi
Physical Review D, 2019年12月19日, ［査読有り］ - The Optically Thick Rotating Magnetic Wind from a Massive White Dwarf Merger Product
Kazumi Kashiyama; Kotaro Fujisawa; Toshikazu Shigeyama
The Astrophysical Journal, 2019年12月09日, ［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
The Astrophysical Journal, 2019年02月, ［査読有り］ - The W4 method: a new multi-dimensional root-finding scheme for nonlinear systems of equations
Hirotada Okawa; Kotaro Fujisawa; Yu Yamamoto; Ryosuke Hirai; Nobutoshi Yasutake; Hiroki Nagakura; Shoichi Yamada
eprint arXiv:1809.04495, 2018年09月 - Hydrostatic Equilibria of Rotating Stars with Realistic Equation of State
Nobutoshi Yasutake; Kotaro Fujisawa; Hirotada Okawa; Shoichi Yamada
JPS Conf.Proc., 2018年, ［査読有り］ - Rotational stellar structures based on the Lagrangian variational principle
Nobutoshi Yasutake; Kotaro Fujisawa; Shoichi Yamada
COMPACT STARS IN THE QCD PHASE DIAGRAM V, 2017年, ［査読有り］ - Rotational equilibria by Lagrangian variational principle: towards multidimensional stellar evolutions
Nobutoshi Yasutake; Kotaro Fujisawa; Shoichi Yamada
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2016年12月, ［査読有り］ - Hyperbolic self-gravity solver for large scale hydrodynamical simulations
Ryosuke Hirai; Hiroki Nagakura; Hirotada Okawa; Kotaro Fujisawa
PHYSICAL REVIEW D, 2016年04月, ［査読有り］ - A versatile numerical method for obtaining structures of rapidly rotating baroclinic stars: self-consistent and systematic solutions with shellular-type rotation
Kotaro Fujisawa
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2015年12月, ［査読有り］ - Magnetized stars with differential rotation and a differential toroidal field
Kotaro Fujisawa
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2015年07月, ［査読有り］ - Appearance of the prolate and the toroidal magnetic field dominated stars: Analytic approach
Kotaro Fujisawa; Yoshiharu Eriguchi
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2015年06月, ［査読有り］ - Particle simulation for rotating white dwarf magnetosphere
Tomohide Wada; Kotaro Fujisawa
The 13th Marcel Grossmann Meeting: On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Proceedings of the MG13 Meeting on General Relativity, 2012, 2015年, ［査読有り］ - A novel formulation by Lagrangian variational principle for rotational equilibria: towards multidimensional stellar evolutions
Nobutoshi Yasutake; Kotaro Fujisawa; Shoichi Yamada
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2015年01月, ［査読有り］ - Equilibrium solutions of relativistic rotating stars with mixed poloidal and toroidal magnetic fields
Koji Uryu; Eric Gourgoulhon; Charalampos M. Markakis; Kotaro Fujisawa; Antonios Tsokaros; Yoshiharu Eriguchi
PHYSICAL REVIEW D, 2014年11月, ［査読有り］ - Magnetic field configurations of a magnetar throughout its interior and exterior - core, crust and magnetosphere
Kotaro Fujisawa; Shota Kisaka
Monthly Notices of the Royal Astronomical Society, 2014年09月05日, ［査読有り］ - Axisymmetric and stationary magnetic field structures in neutron star crusts under various boundary conditions
Kotaro Fujisawa; Shota Kisaka
Proceedings of the International Astronomical Union, 2014年08月, ［査読有り］ - Prolate stars due to meridional flows
Kotaro Fujisawa; Yoshiharu Eriguchi
Monthly Notices of the Royal Astronomical Society: Letters, 2014年02月, ［査読有り］ - Prolate stars due to meridional flows
Kotaro Fujisawa; Yoshiharu Eriguchi
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2014年02月, ［査読有り］ - A novel formulation by Lagrangian variational principle for rotational equilibria: Towards multidimensional stellar evolutions
Nobutoshi Yasutake; Kotaro Fujisawa; Shoichi Yamada
Monthly Notices of the Royal Astronomical Society: Letters, 2014年, ［査読有り］ - Magnetic field structures inside magnetars with strong toroidal field
Kotaro Fujisawa
Proceedings of the International Astronomical Union, 2014年, ［査読有り］ - Coexistence of oppositely flowing multi-ϕ currents: key to large toroidal magnetic fields within stars
Kotaro Fujisawa; Yoshiharu Eriguchi
Monthly Notices of the Royal Astronomical Society, 2013年06月, ［査読有り］ - Counter effects of meridional flows and magnetic fields in stationary axisymmetric self-gravitating barotropes under the ideal MHD approximation: clear examples - toroidal configurations
Kotaro Fujisawa; Rohta Takahashi; Shijun Yoshida; Yoshiharu Eriguchi
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2013年05月, ［査読有り］ - Axisymmetric and stationary structures of magnetized barotropic stars with extremely strong magnetic fields deep inside
Kotaro Fujisawa; Shin'ichirou Yoshida; Yoshiharu Eriguchi
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2012年05月, ［査読有り］ - Equilibrium states of magnetized disc-central compact object systems
Kotaro Fujisawa; Rohta Takahashi; Shijun Yoshida; Yoshiharu Eriguchi
RESCEU Symposium on General Relativity and Gravitation, JGRG 22, 2012年 - Stationary and axisymmetric magnetized equilibria of stars and winds
Shin Yoshida; Kotaro Fujisawa; Yoshiharu Eriguchi; Shijun Yoshida; Rohta Takahashi
ADVANCES IN PLASMA ASTROPHYSICS, 2011年, ［査読有り］ - Stationary and axisymmetric configurations of compact stars with extremely strong and highly localized magnetic fields
Kotaro Fujisawa; Shin'ichiro Yoshida; Yoshiharu Eriguchi
ADVANCES IN PLASMA ASTROPHYSICS, 2011年, ［査読有り］
共同研究・競争的資金等の研究課題
担当経験のある科目
