Dynamics of kaons and hyperons in neutron star matter

这一年的主要研究是库仑屏蔽和一级相变中结构混合相的可能性，如K介子凝聚和核物质中K介子凝聚的可能性，以及它对高能重离子反应中K介子反常产生的意义。此外，我们还研究了高密度夸克物质的铁磁性和色超导电性。对于一级相跃迁离子中的混合相问题，我们通过数值求解密度泛函理论给出的运动方程，研究了库仑屏蔽效应和粒子密度分布。结果表明，屏蔽效应使混合相中的几何结构在力学上变得不稳定，从而使混合相的密度区域受到很大限制。这与以前在强子-夸克退禁闭跃迁背景下的半定量处理给出的结果是一致的。这些r…更多的成果已经在国际会议上公布。我们正在检查计算的细节并准备一篇论文。对于核物质中的Kaon凝聚，我们计算了由Lambda粒子-核子空穴状态给出的Kaon自能项，发现通常的核物质对于Kaon对的形成和具有一定密度的反Kaon量子数的Lambda粒子-核子空穴集体态变得不稳定。这不同于以往研究中同时产生拉姆达粒子和K介子的K介子凝聚机制。本研究中的临界密度比以前的要低得多，因此我们期望对重离子实验有很强的启示意义。我们正在准备一篇关于这个主题的论文。除了这些工作，我们还研究了夸克物质中的磁性及其与色超导的共存。一些成果已经在国际会议上提出，我们现在正在准备一篇论文。较少

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