Rchr
J-GLOBAL ID:201401094018211583   Update date: Feb. 01, 2024

Okawa Hirotada

オオカワ ヒロタダ | Okawa Hirotada
Affiliation and department:
Job title: Senior Researcher(Associate Professor)
Research field  (1): Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research keywords  (2): Computational Science ,  Astrophysics
Research theme for competitive and other funds  (4):
  • 2023 - 2026 画期的な非線形最適化ソルバーを用いた高密度天体の構造解析
  • 2020 - 2023 General relativistic rotating stars for evolution in the Lagrangian description
  • 2019 - 2022 Theoretical study of the mass and angular momentum distribution of primordial black holes
  • 2017 - 2019 Development of a Novel Numerical Scheme for Multi-dimensional Stellar Evolution Calculations
Papers (67):
  • Kei-ichi Maeda, Priti Gupta, Hirotada Okawa. Dynamics of a binary system around a supermassive black hole. Physical Review D. 2023. 107. 12
  • Misa Ogata, Hirotada Okawa, Kotaro Fujisawa, Nobutoshi Yasutake, Yu Yamamoto, Shoichi Yamada. A Lagrangian construction of rotating star models. Monthly Notices of the Royal Astronomical Society. 2023. 521. 2. 2561-2576
  • Chul-Moon Yoo, Tomohiro Harada, Hirotada Okawa. Threshold of primordial black hole formation in nonspherical collapse (vol 102, 043526, 2020). PHYSICAL REVIEW D. 2023. 107. 4
  • Ryuichiro Akaho, Akira Harada, Hiroki Nagakura, Wakana Iwakami, Hirotada Okawa, Shun Furusawa, Hideo Matsufuru, Kohsuke Sumiyoshi, Shoichi Yamada. Protoneutron Star Convection Simulated with a New General Relativistic Boltzmann Neutrino Radiation Hydrodynamics Code. Astrophysical Journal. 2023. 944. 1
  • Hirotada Okawa, Kotaro Fujisawa, Nobutoshi Yasutake, Misa Ogata, Yu Yamamoto, Shoichi Yamada. A novel Lagrangian formulation to construct relativistic rotating stars: towards its application to their evolution calculations. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2023. 520. 1. 24-43
more...
MISC (1):
  • 小形美沙, 大川博督, 藤澤幸太郎, 安武伸俊, 山田章一. 2次元高速回転星の擬似的進化計算. 日本天文学会年会講演予稿集. 2021. 2021
Lectures and oral presentations  (9):
  • A numerical analysis with the W4 method for the structure of relativistic rotating stars in the Lagrangian formulation
    (2023)
  • Wavelet Analysis
    (Astrophysics group Colloquium 2023)
  • Relativistic rotating stars in the Lagrangian formulation by the W4 method
    (2022)
  • A new method for the system of nonlinear equations -- Newton-Raphson method and W4 method --
    (2022)
  • A novel formulation for the evolution of relativistic rotating stars
    (the 23rd International Conference on General Relativity and Gravitation 2022)
more...
Works (1):
  • A new multi-dimensional root finder for a system of nonlinear equations
    Hirotada Okawa 2022 - 現在
Work history (7):
  • 2021/04 - 現在 Waseda University Institue for Advanced Study
  • 2019/04 - 2021/03 Waseda University Institue for Advanced Study
  • 2018/04 - 2019/03 Waseda University Research Institute for Science and Engineering
  • 2014/07 - 2019/03 Kyoto University Yukawa Institute for Theoretical Physics
  • 2014/07 - 2018/03 Waseda University Research Institute for Science and Engineering
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