Fujisawa Kotaro
| Center for Promotion of Higher Education Division of Liberal Arts | Associate Professor |
Career
- Apr. 2026 - Present
Kogakuin University, Center for Promotion of Higher Education Division of Liberal Arts, Associate Professor - Apr. 2023 - Mar. 2026
Department of Liberal Arts, Tokyo University of Technology, Senior Assistant Professor - Apr. 2023 - Mar. 2025
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 - Mar. 2022 - Mar. 2023
Department of Physics, Graduate School of Science, The University of Tokyo, Project Assistant Professor - Apr. 2019 - Feb. 2022
University of Tokyo, Research Center for the Early Universe, Project Assistant Professor - Apr. 2016 - Mar. 2019
Waseda University, Faculty of Science and Engineering - Apr. 2014 - Mar. 2016
Waseda University, Faculty of Science and Engineering - Apr. 2011 - Mar. 2014
The University of Tokyo, College of Arts and Sciences
Educational Background
IDs
Identifiers
研究者番号：30732408
researchmap会員ID：7000007506
J-Global ID：201401067189146995
Research Field
Paper
- 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, 26 Feb. 2024 - 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, 09 May 2023 - Quantum algorithm for collisionless Boltzmann simulation of self-gravitating systems
Soichiro Yamazaki; Fumio Uchida; Kotaro Fujisawa; Naoki Yoshida
29 Mar. 2023 - 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, 07 Mar. 2023, [Reviewed] - Evolutionary deformation toward the elastic limit by a magnetic field confined in the neutron--star crust
Yasufumi Kojima; Shota Kisaka; Kotaro Fujisawa
04 Mar. 2023 - 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, Jan. 2023, [Reviewed] - 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, Jan. 2023, [Reviewed] - 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, 22 Dec. 2022, [Reviewed] - 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, 09 Dec. 2022, [Reviewed] - Self-similar Solution of Rotating Eruptive Outflows on Its Equatorial Plane
Takatoshi Ko; Kotaro Fujisawa; Toshikazu Shigeyama
The Astrophysical Journal, 01 Dec. 2022, [Reviewed] - Magnetically confined mountains on accreting neutron stars with multipole magnetic fields
Kotaro Fujisawa; Kisaka Shota; Yasufumi Kojima
Monthly Notices of the Royal Astronomical Society, 14 Sep. 2022, [Reviewed] - 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, 08 Aug. 2022, [Reviewed] - Singularity-Avoiding Multi-Dimensional Root-Finder
Hirotada Okawa; Kotaro Fujisawa; Yu Yamamoto; Nobutoshi Yasutake; Misa Ogata; Shoichi Yamada
arXiv:2204.09941, 21 Apr. 2022 - Magnetic field sustained by the elastic force in neutron star crusts
Yasufumi Kojima; Shota Kisaka; Kotaro Fujisawa
Monthly Notices of the Royal Astronomical Society, 01 Feb. 2022, [Reviewed] - Magneto-elastic equilibrium of a neutron star crust
Yasufumi Kojima; Shota Kisaka; Kotaro Fujisawa
Monthly Notices of the Royal Astronomical Society, 30 Jul. 2021, [Reviewed] - Evolution of magnetic deformation in neutron star crust
Yasufumi Kojima; Shota Kisaka; Kotaro Fujisawa
Monthly Notices of the Royal Astronomical Society, 09 Feb. 2021, [Reviewed] - 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, 19 Dec. 2019, [Reviewed] - The Optically Thick Rotating Magnetic Wind from a Massive White Dwarf Merger Product
Kazumi Kashiyama; Kotaro Fujisawa; Toshikazu Shigeyama
The Astrophysical Journal, 09 Dec. 2019, [Reviewed] - 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, Feb. 2019, [Reviewed] - 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, Sep. 2018 - Hydrostatic Equilibria of Rotating Stars with Realistic Equation of State
Nobutoshi Yasutake; Kotaro Fujisawa; Hirotada Okawa; Shoichi Yamada
JPS Conf.Proc., 2018, [Reviewed] - Rotational stellar structures based on the Lagrangian variational principle
Nobutoshi Yasutake; Kotaro Fujisawa; Shoichi Yamada
COMPACT STARS IN THE QCD PHASE DIAGRAM V, 2017, [Reviewed] - Rotational equilibria by Lagrangian variational principle: towards multidimensional stellar evolutions
Nobutoshi Yasutake; Kotaro Fujisawa; Shoichi Yamada
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Dec. 2016, [Reviewed] - Hyperbolic self-gravity solver for large scale hydrodynamical simulations
Ryosuke Hirai; Hiroki Nagakura; Hirotada Okawa; Kotaro Fujisawa
PHYSICAL REVIEW D, Apr. 2016, [Reviewed] - 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, Dec. 2015, [Reviewed] - Magnetized stars with differential rotation and a differential toroidal field
Kotaro Fujisawa
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Jul. 2015, [Reviewed] - Appearance of the prolate and the toroidal magnetic field dominated stars: Analytic approach
Kotaro Fujisawa; Yoshiharu Eriguchi
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, Jun. 2015, [Reviewed] - 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, [Reviewed] - 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, Jan. 2015, [Reviewed] - 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, Nov. 2014, [Reviewed] - 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, 05 Sep. 2014, [Reviewed] - Axisymmetric and stationary magnetic field structures in neutron star crusts under various boundary conditions
Kotaro Fujisawa; Shota Kisaka
Proceedings of the International Astronomical Union, Aug. 2014, [Reviewed] - Prolate stars due to meridional flows
Kotaro Fujisawa; Yoshiharu Eriguchi
Monthly Notices of the Royal Astronomical Society: Letters, Feb. 2014, [Reviewed] - Prolate stars due to meridional flows
Kotaro Fujisawa; Yoshiharu Eriguchi
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Feb. 2014, [Reviewed] - 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, [Reviewed] - Magnetic field structures inside magnetars with strong toroidal field
Kotaro Fujisawa
Proceedings of the International Astronomical Union, 2014, [Reviewed] - 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, Jun. 2013, [Reviewed] - 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, May 2013, [Reviewed] - 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, May 2012, [Reviewed] - 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 - Stationary and axisymmetric magnetized equilibria of stars and winds
Shin Yoshida; Kotaro Fujisawa; Yoshiharu Eriguchi; Shijun Yoshida; Rohta Takahashi
ADVANCES IN PLASMA ASTROPHYSICS, 2011, [Reviewed] - 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, [Reviewed]
Research Themes
- 01 Apr. 2020 - 31 Mar. 2024
Spin evolution of cool stars and their habitable planets
Grant-in-Aid for Early-Career Scientists, The University of Tokyo - 01 Apr. 2020 - 31 Mar. 2022
Continuous gravitational wave and a neutron star interior in a binary system
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), The University of Tokyo - Apr. 2017 - Mar. 2019
革新的な数値計算スキームで挑む多次元的恒星進化計算 - Apr. 2016 - Mar. 2019
高速回転する系外惑星の構造の系統的研究 - Apr. 2016 - Mar. 2019
強磁場中性子星マグネターの内部磁場の起源とその進化の解明
Courses
