• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Theoretical research for neutron star matter evolution

Research Project

Project/Area Number 19K14723
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionKanto Gakuin University (2021-2023)
Tokyo University of Science (2019-2020)

Principal Investigator

古澤 峻  関東学院大学, 理工学部, 講師 (40737251)

Project Period (FY) 2019-04-01 – 2025-03-31
Project Status Granted (Fiscal Year 2023)
Budget Amount *help
¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2022: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2021: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2019: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Keywords宇宙物理(理論) / 宇宙物理(理論) / 原子核(理論)
Outline of Research at the Start

本研究の目的は「中性子星を作る物質は何か?それがどう進化するか?」を解き明かすことである。中性子星を作る物質は、ハドロン・クォークと荷電レプトンのゼロ温度極限・β平衡状態であり、主たる成分は中性子であると考えられている。しかし、実際には、冷却や降着などに応じて、準安定な物質も混在する可能性がある。そこで本研究では、中性子物質の準核統計平衡・元素合成計算、クォーク相形成の波面解析を行い、中性子星の表面付近や中心部分における素過程、物質組成と天体構造の共進化、観測への影響を包括的に解き明かす。

Outline of Annual Research Achievements

本研究の目的は「中性子星を作る物質は何か?それがどう進化するか?」を解き明かすことである。中性子星を作る物質は、ハドロン・クォークと荷電レプトン のゼロ温度極限・β平衡状態であり、主たる成分は中性子であると考えられている。しかし、実際には、冷却や降着などに応じて、準安定な物質も混在する可能 性がある。そこで本研究では、中性子物質の準核統計平衡・元素合成計算、クォーク相形成の波面解析を行い、中性子星の表面付近や中心部分における素過程、 物質組成と天体構造の共進化、観測への影響を包括的に解き明かす。 本年度は、重力崩壊型超新星爆発に関する研究を中心に進め、レビュー論文1報を発表した。その論文においては、2次元ニュートリノ輻射輸送超新星爆発シミュレーションコード、3次元ニュートリノ輻射輸送超新星爆発シミュレーションコード、一般相対論的超新星爆発シミュ レーションコードなどを用いた研究について総括した。 またドイツで開かれた国際学会において招待講演を行い、超新星爆発中に現れる原子核、超新星爆発における状態方程式の影響など、超新星原子核に関し て総括した。中性子星外殻における原子核混合の計算、超新星爆発におけるダイニュートロンやテトラニュートロンといった中性子のみで構成された原子核の出現に関する研究、超新星爆発や原子中性子星、中性子星連星合体の計算に広く用いることを念頭においた公開用の核統計平衡コードの開発を始めた。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

高温物質の状態方程式の計算が順調に進み、学術論文も順調に発表している。

Strategy for Future Research Activity

研究計画の骨組みである準核統計平衡計算の完成を最優先に進める。最終的には、それら 中性子星冷却計算に適用し、中性子表面における元素組成を明らかに する。

Report

(5 results)
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (28 results)

All 2024 2023 2022 2021 2020 2019

All Journal Article (16 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 16 results,  Open Access: 10 results) Presentation (12 results) (of which Int'l Joint Research: 7 results,  Invited: 6 results)

  • [Journal Article] Physical mechanism of core-collapse supernovae that neutrinos drive2024

    • Author(s)
      YAMADA Shoichi、NAGAKURA Hiroki、AKAHO Ryuichiro、HARADA Akira、FURUSAWA Shun、IWAKAMI Wakana、OKAWA Hirotada、MATSUFURU Hideo、SUMIYOSHI Kohsuke
    • Journal Title

      Proceedings of the Japan Academy, Series B

      Volume: 100 Issue: 3 Pages: 190-233

    • DOI

      10.2183/pjab.100.015

    • ISSN
      0386-2208, 1349-2896
    • Year and Date
      2024-03-11
    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Protoneutron Star Convection Simulated with a New General Relativistic Boltzmann Neutrino Radiation Hydrodynamics Code2023

    • Author(s)
      Akaho Ryuichiro、Harada Akira、Nagakura Hiroki、Iwakami Wakana、Okawa Hirotada、Furusawa Shun、Matsufuru Hideo、Sumiyoshi Kohsuke、Yamada Shoichi
    • Journal Title

      The Astrophysical Journal

      Volume: 944 Issue: 1 Pages: 60-60

    • DOI

      10.3847/1538-4357/acad76

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nuclei in core-collapse supernovae engine2023

    • Author(s)
      Furusawa S.、Nagakura H.
    • Journal Title

      Progress in Particle and Nuclear Physics

      Volume: 129 Pages: 104018-104018

    • DOI

      10.1016/j.ppnp.2022.104018

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Dark Matter Capture by Neutron Stars with Modern Nuclear Equations of State2022

    • Author(s)
      Kaneda Yuka、Furusawa Shun
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 91 Issue: 6

    • DOI

      10.7566/jpsj.91.065003

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Principal-axis Analysis of the Eddington Tensor for the Early Post-bounce Phase of Rotational Core-collapse Supernovae2022

    • Author(s)
      Iwakami Wakana、Harada Akira、Nagakura Hiroki、Akaho Ryuichiro、Okawa Hirotada、Furusawa Shun、Matsufuru Hideo、Sumiyoshi Kohsuke、Yamada Shoichi
    • Journal Title

      The Astrophysical Journal

      Volume: 933 Issue: 1 Pages: 91-91

    • DOI

      10.3847/1538-4357/ac714b

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Leptonic and semi-leptonic neutrino interactions with muons in proto-neutron star cooling2022

    • Author(s)
      Sugiura Ken’ichi、Furusawa Shun、Sumiyoshi Kohsuke、Yamada Shoichi
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2022 Issue: 11

    • DOI

      10.1093/ptep/ptac118

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effects of nuclear matter and composition in core-collapse supernovae and long-term proto-neutron star cooling2022

    • Author(s)
      Sumiyoshi Kohsuke、Furusawa Shun、Nagakura Hiroki、Harada Akira、Togashi Hajime、Nakazato Ken’ichiro、Suzuki Hideyuki
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2023 Issue: 1 Pages: 1-32

    • DOI

      10.1093/ptep/ptac167

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Electron In-Medium Effects on Electron Captures of Neutron-Rich Nuclei in Stellar Core Collapse2021

    • Author(s)
      Kato Masaki、Furusawa Shun、Suzuki Katsuhiko
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 90 Issue: 10 Pages: 105001-105001

    • DOI

      10.7566/jpsj.90.105001

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Multidimensional Boltzmann Neutrino Transport Code in Full General Relativity for Core-collapse Simulations2021

    • Author(s)
      Akaho Ryuichiro、Harada Akira、Nagakura Hiroki、Sumiyoshi Kohsuke、Iwakami Wakana、Okawa Hirotada、Furusawa Shun、Matsufuru Hideo、Yamada Shoichi
    • Journal Title

      The Astrophysical Journal

      Volume: 909 Issue: 2 Pages: 210-210

    • DOI

      10.3847/1538-4357/abe1bf

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Nuclei in central engine of core-collapse supernovae2020

    • Author(s)
      Furusawa Shun
    • Journal Title

      Physica Scripta

      Volume: 95 Issue: 7 Pages: 074002-074002

    • DOI

      10.1088/1402-4896/ab8c15

    • Related Report
      2020 Research-status Report 2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Degeneracy effects and Bose condensation in warm nuclear matter with light and heavy clusters2020

    • Author(s)
      Furusawa Shun、Mishustin Igor
    • Journal Title

      Nuclear Physics A

      Volume: 1002 Pages: 121991-121991

    • DOI

      10.1016/j.nuclphysa.2020.121991

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Simulations of the Early Postbounce Phase of Core-collapse Supernovae in Three-dimensional Space with Full Boltzmann Neutrino Transport2020

    • Author(s)
      Iwakami Wakana、Okawa Hirotada、Nagakura Hiroki、Harada Akira、Furusawa Shun、Sumiyoshi Kosuke、Matsufuru Hideo、Yamada Shoichi
    • Journal Title

      The Astrophysical Journal

      Volume: 903 Issue: 2 Pages: 82-82

    • DOI

      10.3847/1538-4357/abb8cf

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Boltzmann-radiation-hydrodynamics Simulations of Core-collapse Supernovae with Different Equations of State: The Role of Nuclear Composition and the Behavior of Neutrinos2020

    • Author(s)
      Harada Akira、Nagakura Hiroki、Iwakami Wakana、Okawa Hirotada、Furusawa Shun、Sumiyoshi Kohsuke、Matsufuru Hideo、Yamada Shoichi
    • Journal Title

      The Astrophysical Journal

      Volume: 902 Issue: 2 Pages: 150-150

    • DOI

      10.3847/1538-4357/abb5a9

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Nuclear statistical equilibrium equation of state with a parametrized Dirac?Br?ckner Hartree?Fock calculation2020

    • Author(s)
      Furusawa Shun、Togashi Hajime、Sumiyoshi Kohsuke、Saito Koichi、Yamada Shoichi、Suzuki Hideyuki
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2020 Issue: 1

    • DOI

      10.1093/ptep/ptz135

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Fast collective neutrino oscillations inside the neutrino sphere in core-collapse supernovae2020

    • Author(s)
      Delfan Azari Milad、Yamada Shoichi、Morinaga Taiki、Nagakura Hiroki、Furusawa Shun、Harada Akira、Okawa Hirotada、Iwakami Wakana、Sumiyoshi Kohsuke
    • Journal Title

      Physical Review D

      Volume: 101 Issue: 2 Pages: 023018-023018

    • DOI

      10.1103/physrevd.101.023018

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] New Neutron Star Equation of State with Quark-Hadron Crossover2019

    • Author(s)
      Baym Gordon、Furusawa Shun、Hatsuda Tetsuo、Kojo Toru、Togashi Hajime
    • Journal Title

      The Astrophysical Journal

      Volume: 885 Issue: 1 Pages: 42-42

    • DOI

      10.3847/1538-4357/ab441e

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Nuclear equation-of-state and Nuclei in Core-Collapse Supernovae2023

    • Author(s)
      Shun Furusawa
    • Organizer
      NuSym23, XIth International Symposium on Nuclear Symmetry Energy
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 原始中性子星と中性子星クラストの状態方程式2023

    • Author(s)
      古澤峻
    • Organizer
      日本物理学会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 重力崩壊型超新星爆発中心エンジンにおける衝撃波加熱物質の原子核組成2022

    • Author(s)
      古澤峻
    • Organizer
      日本物理学会
    • Related Report
      2022 Research-status Report
  • [Presentation] 超新星爆発中心の原子核2022

    • Author(s)
      古澤峻
    • Organizer
      重力波天文学時代における超新星研究
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Nuclei in Core-Collapse Supernovae2022

    • Author(s)
      Shun Furusawa
    • Organizer
      N3AS Seminar
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Neutrino-Nucleus Interactions in Central Engine of Core-Collapse Supernovae2020

    • Author(s)
      Shun Furusawa
    • Organizer
      Neutrino 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 重力崩壊型超新星爆発における軽原子核の役割と凝縮可能性2020

    • Author(s)
      古澤峻
    • Organizer
      日本物理学会
    • Related Report
      2019 Research-status Report
  • [Presentation] 重力崩壊型超新星爆発と原子核2020

    • Author(s)
      古澤峻
    • Organizer
      第3回若手放談会:エキゾチック核物理の将来
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Nuclear equations of state for supernova simulations2020

    • Author(s)
      Shun Furusawa
    • Organizer
      Gravitational wave physics and astronomy: Genesis, The third symposium
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Nuclear equations of state for supernova simulations2019

    • Author(s)
      Shun Furusawa
    • Organizer
      Multi-dimensional Modeling and Multi-Messenger observation from Core-Collapse Supernovae
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Nuclei in Core-Collapse Supernovae matter in compact stars2019

    • Author(s)
      Shun Furusawa
    • Organizer
      8th International Conference on New Frontiers in Physics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Conversion of hadronic matter to quark matter in compact stars2019

    • Author(s)
      Shun Furusawa
    • Organizer
      The 8th Huada QCD School
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

URL: 

Published: 2019-04-18   Modified: 2024-12-25  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi