Dynamics of kaons and hyperons in neutron star matter

中子星物质中介子和超子的动力学

基本信息

批准号：
13640282
负责人：
TATSUMI Toshitaka
金额：
$ 2.18万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

Main researches in this year are the Coulomb screening and the possibility of the structured mixed phase in the first order phase transitions such as kaon con densation and the possibility of kaon condensation in nuclear matter and its implication on the kaon anomalous production in high-energy heavy ion reactions. Moreover, we studied ferromagnetism and color superconductivity in high-density quark matter. As for the issue of the mixed phase in the first order phase transit ions we studied the Coulomb screening effect and particle density profiles consi stently by numerically solving the equations of motion given by the density functional theory. Our results show that the geometrical structures in the mixed phase becomes mechanically unstable by the screening effect, and thereby the density region of the mixed phase is largely limited. This is consistent with the pre vious results given by the semi-quantitative treatment in the context of hadron-quark deconfinement transition. These r … More esults have been already presented in the international conferences. We are now checking the details of the calculations and preparing a paper.As for kaon condensation in nuclear matter, we calculated the kaon self-energy term given by the lambda particle-nucleon hole state and found usual nuclear matter becomes unstable for the pair formation of kaon and the lambda particle-nucleon hole collective state with the quantum number of anti-kaon at certain density. This is the different mechanism from the previous study about kaon condensation, where the lambda particle and kaon are produced simultaneously. The critical density in the present study is very much lowered than the previous one, and there by we expect a strong implication on heavy-ion experiments. We are now preparing a paper on this subject.Besides these works we studied magnetism in quark matter and its coexistence with color superconductivity. Some results have been presented in the international conferences and we are now preparing a paper. Less

今年的主要研究是库仑筛查和结构化混合阶段在一阶相变的可能性，例如kaon凝结和核物质中kaon凝结的可能性及其对高能重型离子反应中kaon异常产生的影响。此外，我们研究了高密度夸克物质中的铁磁和颜色超导性。至于在一阶相位传输离子中混合相的问题，我们通过数值求解密度功能理论给出的运动方程来始终如一地研究了库仑筛选效果和颗粒密度谱。我们的结果表明，混合相中的几何结构在筛选效果上在机械上不稳定，从而在很大程度上受到了混合相的密度区域。这与在强子Quark反式过渡的背景下通过半定量处理给出的先前存在的结果一致。这些r…在国际会议上已经提出了更多的灌输。现在，我们正在检查计算的细节并准备一份论文。由于核物质中的kaon凝结，我们计算了lambda粒子核孔状态给定的kaon自我能源项，并发现普通的核物质变得不稳定，因为Kaon的成对形成了Kaon和Lambda粒子 - 核孔孔集体的集体，该状态与Anti-Kaon的量子数量不稳定。这是与先前关于Kaon凝结的研究不同的机制，在该研究中，简单地产生了Lambda粒子和Kaon。本研究中的临界密度远低于前一个，我们期望对重离子实验产生强烈的影响。现在，我们正在准备有关此主题的论文。看来，我们在夸克物质中研究了磁性及其与颜色超导性的共存。国际会议上已经提出了一些结果，我们现在正在准备一篇论文。较少的