Okawa Hirotada 大川博督

Researcher Number	40633285
Affiliation (Current)	2025: 青森大学, ソフトウェア情報学部, 准教授
Affiliation (based on the past Project Information) *help	2020 – 2023: 早稲田大学, 高等研究所, 准教授(任期付) 2019: 早稲田大学, 高等研究所, 講師(任期付) 2017 – 2018: 早稲田大学, 理工学術院, 次席研究員(研究院講師)
Review Section/Research Field	Principal Investigator Basic Section 12040:Applied mathematics and statistics-related / Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics Except Principal Investigator Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics / Astronomy and related fields
Keywords	Principal Investigator 非線形最適化 / ニュートン法 / 境界値問題 / 数値計算 / 一般相対論 / 非線形連立方程式の解法 / 星の進化計算 / ラグランジュ的定式化 / 星の進化 / 非線形連立方程式 / 相対論的回転星 … More Except Principal Investigator … More 原始ブラックホール / 非線形連立方程式 / 数値計算 / 回転 / 恒星進化計算 / 多次元 Less

Analysis of compact objects by a new optimization solverPrincipal Investigator
- Principal Investigator
  
  大川博督
- Project Period (FY)
  2023 – 2025
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 12040:Applied mathematics and statistics-related
- Research Institution
  Waseda University
General relativistic rotating stars for evolution in the Lagrangian descriptionPrincipal Investigator
- Principal Investigator
  
  Okawa Hirotada
- Project Period (FY)
  2020 – 2023
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
- Research Institution
  Waseda University
Theoretical study of the mass and angular momentum distribution of primordial black holes
- Principal Investigator
  
  Yoo Chulmoon
- Project Period (FY)
  2019 – 2021
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Review Section
  
  Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
- Research Institution
  Nagoya University
Development of a Novel Numerical Scheme for Multi-dimensional Stellar Evolution Calculations
- Principal Investigator
  
  YAMADA Shoichi
- Project Period (FY)
  2017 – 2018
- Research Category
  
  Grant-in-Aid for Challenging Research (Exploratory)
- Research Field
  
  Astronomy and related fields
- Research Institution
  Waseda University

All 2024 2023 2022 2021 2020 2019 2018 2017

All Journal Article Presentation

[Journal Article] W4 - a multi-dimensional root-finding method for nonlinear equations2024
- Author(s)
  Okawa Hirotada
- Journal Title
  
  Research Features
  
  Volume: 151 Pages: 142-145
- DOI
  10.26904/rf-151-6090260628
- Open Access
- Data Source
  KAKENHI-PROJECT-20K03953
[Journal Article] A novel Lagrangian formulation to construct relativistic rotating stars: towards its application to their evolution calculations2023
- Author(s)
  Hirotada Okawa, Kotaro Fujisawa, Nobutoshi Yasutake, Misa Ogata, Yu Yamamoto, Shoichi Yamada
- Journal Title
  
  Monthly Notices of the Royal Astronomical Society
  
  Volume: 520 Issue: 1 Pages: 24-43
- DOI
  10.1093/mnras/stad075
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-20K03951, KAKENHI-PROJECT-20K03953, KAKENHI-PROJECT-20K14512, KAKENHI-PROJECT-21H01083, KAKENHI-PROJECT-19H01895, KAKENHI-PLANNED-19H05811, KAKENHI-ORGANIZER-17H06357, KAKENHI-PUBLICLY-20H04728
[Journal Article] The W4 method: A new multi-dimensional root-finding scheme for nonlinear systems of equations2023
- Author(s)
  Hirotada Okawa, Kotaro Fujisawa, Yu Yamamoto, Ryosuke Hirai, Nobutoshi Yasutake, Hiroki Nagakura , Shoichi Yamada
- Journal Title
  
  Applied Numerical Mathematics
  
  Volume: 183 Pages: 157-172
- DOI
  10.1016/j.apnum.2022.08.019
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20K03951, KAKENHI-PROJECT-20K03953, KAKENHI-PROJECT-20K14512, KAKENHI-PROJECT-21H01083, KAKENHI-PLANNED-19H05811, KAKENHI-ORGANIZER-17H06357, KAKENHI-PUBLICLY-20H04728
[Journal Article] Singularity-Avoiding Multi-Dimensional Root-Finder2022
- Author(s)
  Hirotada Okawa, Kotaro Fujisawa, Yu Yamamoto, Nobutoshi Yasutake, Misa Ogata, Shoichi Yamada
- Journal Title
  
  arXiv
  
  Volume: math.NA
- Data Source
  KAKENHI-PROJECT-20K03953
[Journal Article] A novel formulation for the evolution of relativistic rotating stars2022
- Author(s)
  Hirotada Okawa, Kotaro Fujisawa, Nobutoshi Yasutake, Misa Ogata, Yu Yamamoto, Shoichi Yamada
- Journal Title
  
  arXiv
  
  Volume: gr-qc
- Data Source
  KAKENHI-PROJECT-20K03953
[Journal Article] Primordial black hole formation from massless scalar isocurvature2022
- Author(s)
  Yoo Chul-Moon、Harada Tomohiro、Hirano Shin’ichi、Okawa Hirotada、Sasaki Misao
- Journal Title
  
  Physical Review D
  
  Volume: 105 Issue: 10 Pages: 103538-103538
- DOI
  10.1103/physrevd.105.103538
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19K03876, KAKENHI-PLANNED-20H05853, KAKENHI-PROJECT-19H01895, KAKENHI-PUBLICLY-20H04727
[Journal Article] Threshold of primordial black hole formation in nonspherical collapse2020
- Author(s)
  Yoo Chul-Moon、Harada Tomohiro、Okawa Hirotada
- Journal Title
  
  Physical Review D
  
  Volume: 102 Issue: 4
- DOI
  10.1103/physrevd.102.043526
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19K03876, KAKENHI-PROJECT-19H01895
[Journal Article] Effects of Rotation and Magnetic Field on the Revival of a Stalled Shock in Supernova Explosions2019
- Author(s)
  Fujisawa Kotaro , Okawa Hirotada , Yamamoto Yu , Yamada Shoichi
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 872 Issue: 2 Pages: 155-155
- DOI
  10.3847/1538-4357/aaffdd
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-ORGANIZER-17H06357, KAKENHI-PROJECT-16H03986, KAKENHI-PROJECT-16J10223, KAKENHI-PROJECT-17K18792, KAKENHI-PROJECT-16K17708, KAKENHI-PLANNED-17H06365
[Journal Article] Massive Graviton Geons2018
- Author(s)
  Katsuki Aoki, Kei-ichi Maeda, Yosuke Misonoh, Hirotada Okawa
- Journal Title
  
  Phys.Rev. D
  
  Volume: 97 Issue: 4
- DOI
  10.1103/physrevd.97.044005
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-16K05362, KAKENHI-PROJECT-17K18792, KAKENHI-ORGANIZER-17H06357, KAKENHI-PROJECT-15J05540, KAKENHI-PLANNED-17H06359
[Presentation] W4法を用いたラグランジュ座標における相対論的回転星の構造解析2023
- Author(s)
  大川博督
- Organizer
  日本物理学会2023年春季大会「中性子星クラストの理論研究：原子核物理と宇宙物理の交差点」
- Invited
- Data Source
  KAKENHI-PROJECT-20K03953
[Presentation] A novel formulation for the evolution of relativistic rotating stars2022
- Author(s)
  Hirotada Okawa, Kotaro Fujisawa, Nobutoshi Yasutake, Misa Ogata, Yu Yamamoto, Shoichi Yamada
- Organizer
  23rd International Conference on General Relativity and Gravitation
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20K03953
[Presentation] 新たな非線形連立方程式の解法 - ニュートン・ラフソン法とW4法 -2022
- Author(s)
  大川博督
- Organizer
  電子情報通信学会　非線形問題研究会
- Data Source
  KAKENHI-PROJECT-20K03953
[Presentation] Relativistic rotating stars in the Lagrangian formulation by the W4 method2022
- Author(s)
  Hirotada Okawa
- Organizer
  iTHEMS seminar
- Invited
- Data Source
  KAKENHI-PROJECT-20K03953
[Presentation] ラグランジュ描像における相対論的回転星の進化2021
- Author(s)
  大川博督、藤澤幸太郎、安武伸俊、小形美沙、山本佑、山田章一
- Organizer
  日本物理学会２０２１年秋季大会
- Data Source
  KAKENHI-PROJECT-20K03953
[Presentation] 新しい非線形連立方程式の解法(W4法)を用いた非線形楕円型方程式の解析手法の確立2021
- Author(s)
  大川博督
- Organizer
  WIAS Research Debriefing Session
- Data Source
  KAKENHI-PROJECT-20K03953
[Presentation] Baroclinic Instability2020
- Author(s)
  Hirotada Okawa
- Organizer
  Waseda Astrophysics Group Colloquium
- Data Source
  KAKENHI-PROJECT-20K03953
[Presentation] 星の平衡形状と中性子星の状態方程式2019
- Author(s)
  安武伸俊, 小形美沙, 藤澤幸太郎, 大川博督, 山田章一
- Organizer
  研究会“宇宙の物質進化と元素合成 ”
- Data Source
  KAKENHI-PROJECT-17K18792
[Presentation] ニューラルネットワークによる回転星の構造計算2019
- Author(s)
  安武伸俊, 小形美沙, 藤澤幸太郎, 大川博督, 山田章一
- Organizer
  日本物理学会春季年会
- Data Source
  KAKENHI-PROJECT-17K18792
[Presentation] 重力崩壊型超新星爆発における定常計算のための非線形連立方程式を数値的に計算する革新的な手法2018
- Author(s)
  藤澤幸太郎,大川博督,山本佑,山田章一
- Organizer
  日本天文学会秋季年会
- Data Source
  KAKENHI-PROJECT-17K18792
[Presentation] 天体物理学における非線形連立方程式を数値的に計算する革新的な手法2018
- Author(s)
  藤澤幸太郎,大川博督,山本佑,平井遼介、安武伸俊、長倉洋樹、山田章一
- Organizer
  第31回理論懇談会シンポジウム
- Data Source
  KAKENHI-PROJECT-17K18792
[Presentation] 超新星の停滞衝撃波復活における回転と磁場の効果について2018
- Author(s)
  藤澤幸太郎,大川博督,山本佑,山田章一
- Organizer
  日本物理学会秋季年会
- Data Source
  KAKENHI-PROJECT-17K18792
[Presentation] Effects of rotation and magnetic field on the revival of a stalled shock in supernova explosions2018
- Author(s)
  Kotaro Fujisawa, Hirotada Okawa, Yu Yamamoto & Shoichi Yamada
- Organizer
  Physics of Core-Collapse Supernovae and Compact Star Formations, Waseda University, Tokyo, Japan
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K18792
[Presentation] 質量座標系での二次元回転平衡形状の計算手法の構築へ向けて2017
- Author(s)
  安武伸俊, 大川博督, 藤澤幸太郎, 山田章一
- Organizer
  第30回理論懇シンポジウム「星の物理の新地平」
- Data Source
  KAKENHI-PROJECT-17K18792

1. YAMADA Shoichi (80251403)

# of Collaborated Projects: 1 results

# of Collaborated Products: 7 results
2. Yoo Chulmoon (60467404)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
3. 安武伸俊 (10532393)

# of Collaborated Projects: 1 results

# of Collaborated Products: 6 results
4. 藤澤幸太郎 (30732408)

# of Collaborated Projects: 1 results

# of Collaborated Products: 7 results
5. 原田知広 (60402773)

# of Collaborated Projects: 1 results

# of Collaborated Products: 2 results
6. 佐々木節 (70162386)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
7. 前田恵一

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results

Okawa Hirotada 大川 博督

Research Projects

Research Products

Co-Researchers

Analysis of compact objects by a new optimization solverPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

General relativistic rotating stars for evolution in the Lagrangian descriptionPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Theoretical study of the mass and angular momentum distribution of primordial black holes

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Development of a Novel Numerical Scheme for Multi-dimensional Stellar Evolution Calculations

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

[Journal Article] W4 - a multi-dimensional root-finding method for nonlinear equations2024

Author(s)

Journal Title

DOI

Data Source

[Journal Article] A novel Lagrangian formulation to construct relativistic rotating stars: towards its application to their evolution calculations2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] The W4 method: A new multi-dimensional root-finding scheme for nonlinear systems of equations2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Singularity-Avoiding Multi-Dimensional Root-Finder2022

Author(s)

Journal Title

Data Source

[Journal Article] A novel formulation for the evolution of relativistic rotating stars2022

Author(s)

Journal Title

Data Source

[Journal Article] Primordial black hole formation from massless scalar isocurvature2022

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Threshold of primordial black hole formation in nonspherical collapse2020

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Effects of Rotation and Magnetic Field on the Revival of a Stalled Shock in Supernova Explosions2019

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Massive Graviton Geons2018

Author(s)

Journal Title

DOI

Data Source

[Presentation] W4法を用いたラグランジュ座標における相対論的回転星の構造解析2023

Author(s)

Organizer

Data Source

[Presentation] A novel formulation for the evolution of relativistic rotating stars2022

Author(s)

Organizer

Data Source

[Presentation] 新たな非線形連立方程式の解法 - ニュートン・ラフソン法とW4法 -2022

Okawa Hirotada 大川博督

[Presentation] 重力崩壊型超新星爆発における定常計算のための非線形連立方程式を数値的に計算する革新的な手法2018