Supernova Matter Equation of State Table Based on Heavy-Ion Collisions and Hypernuclear Reactions

基于重离子碰撞和超核反应的超新星物质状态方程

• 批准号: 15540243
• 负责人: OHNISHI Akira
• 金额: $ 1.66万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540243/
• 关键词: Supernova Explosion; Equation of State; Strangeness; Relativistic Mean Field (RMF); Chiral Symmetry; High-Energy Heavy-Ion Collisions; Hydrodynamical Simulation; Black Hole Formation; 集団運動流; (π^-,K^+)反応; 核破砕; (π^-,Κ^+)反応

Nuclear matter properties at various temperatures and densities are expected to affect crucially supernova explosion and black hole formation processes. In this project, we aimed at constructing an equation of state (EOS) and nuclear distribution table for the use of supernova simulations based on heavy-ion collision and hypernuclear reactions. We also aimed at understanding the mechanism of supernova explosion and black hole formation by using the newly constructed supernova matter EOS table.For heavy-ion collisions, we have developed a hadron transport model (JAM-RQMD/S) for high-energy heavy-ion collisions. In this model, the nuclear mean field is included as well as hadron-hadron collisions. We have shown that collective flows are reasonably well explained in a wide energy range (1~160A GeV) with momentum-dependent nuclear mean field. At RHIC enengy, we have compared the results of hydrodynamical model assuming QGP and hadron transport model, suggesting the formation of QGP even in … More lighter system (Cu+Cu). In addition, we have proposed a new hadronization mechanism.In hypernuclear physics, we have analyzed the hyperon production spectra in bound and continuum energy region, and extracted the hyperon potentials in nuclear matter. It is found that potentials forΣand〓are more repulsive than those previously expected. We have also developed a chiral symmetric relativistic mean field model (Chiral RMF) based on the strong coupling lattice QCD.In low density supernova matter, we have compared the EOSs in Nuclear Statistical Equilibrium (NSE) model and the Thomas-Fermi model with RMF. In order to connect these EOSs smoothly, we may need to consider pasta nuclei.Based on these updated information, we have developed new EOS tables of supernova matter, and opened them to public. Since hyperon potentials are more repulsive than expected before, hyperons are suppressed in neutron star core. We also found that density and temperature are not high enough for hyperons to appear in supernova explosions, but that hyperons modifies the neutrino signal of black hole formation. Less

不同温度和密度下的核物质性质预计将对超新星爆炸和黑洞形成过程产生关键影响。在该项目中，我们的目标是构建一个状态方程（EOS）和核分布表，用于基于重离子碰撞和超核反应的超新星模拟。利用新建立的超新星物质物态方程表，对超新星爆发和黑洞形成的机制进行了研究;针对重离子碰撞，建立了高能重离子碰撞的强子输运模型（JAM-RQMD/S）.在这个模型中，除了强子-强子碰撞外，还考虑了核平均场。用动量相关的核平均场在较宽的能量范围（1~ 160 AGeV）内合理地解释了集体流。在RHIC能区，我们比较了假设QGP的流体动力学模型和强子输运模型的结果，认为即使在 ...更多信息 轻合金（Cu+Cu）在超核物理中，我们分析了束缚能区和连续能区的超子产生谱，提取了核物质中的超子势。结果发现，潜在的？和？更排斥比以前预期的。在强耦合格点QCD的基础上，我们发展了手征对称相对论平均场模型（Chiral RMF），并在低密度超新星物质中，比较了核统计平衡（NSE）模型和RMF下的EOS。为了更好地将这些EOS联系起来，我们可能需要考虑pasta核。基于这些更新的信息，我们开发了新的超新星物质EOS表，并向公众开放。由于超子势的排斥性比预期的要大，超子在中子星星核中被抑制。我们还发现，密度和温度不足以让超子在超新星爆炸中出现，但超子会修改黑洞形成的中微子信号。少

项目成果

Hypernuclei and nuclear matter in a chiral SU(3) RMF model

手性 SU(3) RMF 模型中的超核和核物质

• 发表时间: 2007
• 期刊: European Physical Journal A 33
• 作者: 中嶋佑奈;湊祐輔;檜枝光憲;松下琢;和田信雄;H.Murakawa;K. Tsubakihara
• 通讯作者: K. Tsubakihara

Properties of a relativistic equation of state for collapse-driven supernovae

• DOI: 10.1016/j.nuclphysa.2003.10.007
• 发表时间: 2003-10
• 期刊: Nuclear Physics
• 作者: K. Sumiyoshi;Hideyuki Suzuki;Soichi Yamada;H. Toki

Gravitational collapse and neutrino emission of population III massive stars

III族大质量恒星的引力塌缩和中微子发射

• 发表时间: 2006
• 期刊: Astrophys. J. 645
• 作者: A. Ohnishi;N. Kawamoto;K. Miura;K. Tsubakihara;H. Maekawa;K. Sumiyoshi;N.Kawamoto;C.J.Yoon;K.Tsubakihara;P. K. Sahu;K. Nakazato
• 通讯作者: K. Nakazato

Collective Flows in Heavy-Ion Collisions from AGS to SPS energies

重离子碰撞中从 AGS 能量到 SPS 能量的集体流动

• 发表时间: 2006
• 期刊: Pramana 66
• 作者: A. Ohnishi;N. Kawamoto;K. Miura;K. Tsubakihara;H. Maekawa;K. Sumiyoshi;N.Kawamoto;C.J.Yoon;K.Tsubakihara;P. K. Sahu;K. Nakazato;H. Ito;K. Sumiyoshi;A. Ohnishi
• 通讯作者: A. Ohnishi

A.Ohnishi: "SU(3) chiral σ model for positive and negative parity baryons in dense matter"Nuclear Physics. A(印刷中). (2004)

A.Ohnishi：“致密物质中正宇称重子和负宇称重子的 SU(3) 手性 σ 模型”核物理 A（出版中）。