Dynamics of kaons and hyperons in neutron star matter

今年的主要研究内容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介子凝聚的可能性及其对高能重离子反应中K介子异常产生的意义。此外，我们还研究了高密度夸克物质中的铁磁性和色超导性。对于一级相渡越离子中的混合相问题，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，屏蔽效应使混合相的几何结构变得机械不稳定，从而限制了混合相的密度区域。这与前人在强子-夸克退禁闭跃迁背景下半定量处理的结果是一致的。这些r ...更多信息 这些成果已在国际会议上提出。对于核物质中的K介子凝聚，我们计算了λ粒子-核子空穴态给出的K介子自能项，发现当反K介子的量子数达到一定密度时，K介子与λ粒子-核子空穴集体态的成对形成使通常的核物质变得不稳定。这是不同于以前关于K介子凝聚的研究，其中λ粒子和K介子同时产生。在本研究中的临界密度是非常低于前一个，我们期望有一个强有力的重离子实验的影响。我们正在准备一篇关于这个课题的论文。除此之外，我们还研究了夸克物质的磁性及其与色超导性的共存。在国际会议上提出了一些结果，我们现在正在编写一份文件。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