Equation of state for hot and dense nuclear matter in gravitational wave astrophysical phenomena

• Project Area: Gravitational wave physics and astronomy: Genesis
• Project/Area Number: 18H04597
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Research Institution: Tokyo University of Science (2019); Institute of Physical and Chemical Research (2018)
• Principal Investigator: 古澤 峻 東京理科大学, 理学部第一部物理学科, 助教 (40737251)
• Project Period (FY): 2018-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 宇宙物理（理論） / 原子核（理論）

Outline of Annual Research Achievements

重力崩壊型超新星爆発などの重力波天体現象は、重力波・ニュートリノなどの放出源や、核物理の検証場所として重要な研究対象である。本研究課題では、それらの天体現象の解明に不可欠な真の核物質状態方程式の構築を目指し、核物質の性質と天体現象のメカニズムの関連を一貫して解明する。具体的には、最先端の核物質理論に基づく状態方程式データを作成・拡張し超新星シミュレーションに適用することで、核物質理論の違いが超新星爆発に与える影響を明らかにする。また補助的な課題として、超新星爆発に影響を及ぼす原子核の種類や性質を明らかにする。
本年度は、順調に研究が進み、学術論文３報（主著１報、共著２報）を発表した。主著論文としては、相対論的ブルックナーハートリーフォック理論に基づく多核種の状態方程式の計算を行った。既に計算済みである変分法に基づく状態方程式に比べて、対称核物質は柔らかく、中性子物質は硬い性質であり、超新星爆発シミュレーションにおいて重大な違いを生むことが予想される。それに関連して、国際学会発表４回（１回は招待講演）、国内学会２回（うち１回は招待講演）を行った。共著論文においては、ニュートリノ振動が超新星爆発シミュレーションに与える影響の解析や、重力波観測と無矛盾であり変分法に基づくハドロン状態方程式とＮＪＬ模型に基づくクォーク状態方程式をクロスオーバー相転移で繋ぐ中性子星物質の状態方程式の計算などを行った。

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] プリンストン大学/イリノイ大学(米国)
• [Int'l Joint Research] フランクフルト先進研究所(ドイツ)
• [Int'l Joint Research] 華中師範大学(中国)
• [Int'l Joint Research] Princeton University(米国)
• [Journal Article] Nuclear statistical equilibrium equation of state with a parametrized Dirac?Br?ckner Hartree?Fock calculation (2020)
  • 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
  • Peer Reviewed / Open Access
• [Journal Article] Fast collective neutrino oscillations inside the neutrino sphere in core-collapse supernovae (2020)
  • 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
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Nuclei in central engine of core-collapse supernovae (2020)
  • Author(s): Furusawa Shun
  • Journal Title: Physica Scripta Volume: 95 Issue: 7 Pages: 074002-074002
  • DOI: 10.1088/1402-4896/ab8c15
  • Peer Reviewed
• [Journal Article] New Neutron Star Equation of State with Quark-Hadron Crossover (2019)
  • 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
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] On the Neutrino Distributions in Phase Space for the Rotating Core-collapse Supernova Simulated with a Boltzmann-neutrino-radiation-hydrodynamics Code (2019)
  • Author(s): Harada Akira、Nagakura Hiroki、Iwakami Wakana、Okawa Hirotada、Furusawa Shun、Matsufuru Hideo、Sumiyoshi Kohsuke、Yamada Shoichi
  • Journal Title: The Astrophysical Journal Volume: 872 Issue: 2 Pages: 181-181
  • DOI: 10.3847/1538-4357/ab0203
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Comparing Treatments of Weak Reactions with Nuclei in Simulations of Core-collapse Supernovae (2019)
  • Author(s): Nagakura Hiroki、Furusawa Shun、Togashi Hajime、Richers Sherwood、Sumiyoshi Kohsuke、Yamada Shoichi
  • Journal Title: The Astrophysical Journal Supplement Series Volume: 240 Issue: 2 Pages: 38-38
  • DOI: 10.3847/1538-4365/aafac9
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Sensitivity of nuclear statistical equilibrium to nuclear uncertainties during stellar core collapse (2018)
  • Author(s): Furusawa Shun
  • Journal Title: Physical Review C Volume: 98 Issue: 6 Pages: 065802-065802
  • DOI: 10.1103/physrevc.98.065802
  • Peer Reviewed
• [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
• [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
  • Invited
• [Presentation] Nuclear equations of state for supernova simulations (2020)
  • Author(s): Shun Furusawa
  • Organizer: Gravitational wave physics and astronomy: Genesis, The third symposium
  • Int'l Joint Research
• [Presentation] Nuclear equations of state for supernova simulations (2019)
  • Author(s): Shun Furusawa
  • Organizer: Multi-dimensional Modeling and Multi-Messenger observation from Core-Collapse Supernovae
  • Int'l Joint Research
• [Presentation] Nuclei in Core-Collapse Supernovae matter in compact stars (2019)
  • Author(s): Shun Furusawa
  • Organizer: 8th International Conference on New Frontiers in Physics
  • Int'l Joint Research / Invited
• [Presentation] Conversion of hadronic matter to quark matter in compact stars (2019)
  • Author(s): Shun Furusawa
  • Organizer: The 8th Huada QCD School
  • Int'l Joint Research
• [Presentation] 天体物質の核統計平衡における原子核物理の不定性 (2019)
  • Author(s): 古澤 峻
  • Organizer: 日本物理学会
• [Presentation] 超新星爆発におけるニュートリノ原子核反応 (2019)
  • Author(s): 古澤 峻
  • Organizer: ニュートリノ原子核反応とニュートリノ相互作用
  • Invited
• [Presentation] Nuclei in Core-Collapse Supernovae (2019)
  • Author(s): 古澤 峻
  • Organizer: WORKSHOP ON QUANTUM MANY-BODY PROBLEMS IN PARTICLE, NUCLEAR, AND ATOMIC PHYSICS
  • Int'l Joint Research
• [Presentation] 超新星ニュートリノ (2018)
  • Author(s): 古澤 峻
  • Organizer: 九大理研ワークショップ
• [Presentation] Nuclear Physics Uncertainties in Core-Collapse Supernovae (2018)
  • Author(s): 古澤 峻
  • Organizer: theories of nuclear structure and dynamics
  • Int'l Joint Research / Invited
• [Presentation] Equations of state of hot and dense nuclear matter for gravitational wave physics (2018)
  • Author(s): 古澤 峻
  • Organizer: Gravitational Wave Physics and Astronomy: Genesis
  • Int'l Joint Research
• [Presentation] Nuclear Uncertainties in Equation of State for Core-Collapse Supernovae (2018)
  • Author(s): 古澤 峻
  • Organizer: Deciphering multi-Dimensional nature of core-collapse SuperNovae via Gravitational-Wave and neutrino signatures
  • Int'l Joint Research
• [Presentation] Nuclear Weak Interactions in Core-Collapse Supernovae (2018)
  • Author(s): 古澤 峻
  • Organizer: Neutrino2018
  • Int'l Joint Research