Kaon condensation during the thermal evolution of protoneutron stars and the possibility of low-mass block hola

原中子星热演化过程中的 Kaon 凝结和低质量块 Hola 的可能性

基本信息

批准号：
11640272
负责人：
TATSUMI Toshitaka
金额：
$ 1.79万
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：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

l) Possibility of the delayed collapse of protoneutron stars due to Kaon condensationWe have presented a new formulation of kaon condensation in the presence of neutrinos and temperature and derived the equation of state (EOS), based on chiral symmetry. Using this EOS, we have systematically examined the equilibrium structure of protoneutron stars and discussed its properties in detail as functions of entropy and lepton number. Then we have discussed the possibility of the delayed collapse of protoneutron stars due to the occurrennce of kaon condensation and the large softening of EOS during their thermal evolution. As a result we have shown the importance of the neutrino trapping effect, which has not benn emphasized yet. We have also clarified the specific features of the chiral model by comparing our results with those given in other papers. Our results have been published in the journals and also reported in the international conferences.2) Hyperonic matter and hyperon superfluidit … More yUsing the realistic hyperon-hyperon and -nucleon interactions obtained from the studies for hypernuclei, we have studied the problem of hyperon mixing in high density nuclear matter and the possibility of hyperon superfluidity. As a result we have suggested that there should be additional repulsive effects in hyperonic matter by considering the drastic softening of EOS and the observational mass of neutron stars. As for the hyperon superfluidity, we have concluded that hyperons such as Λ, Σ^-, Ξ^- should show superfluidity.3) Ferromagnetism of quark matterWe have studied the possibility of ferromagnetism of nuclear matter and quark matter as an origin of magnetic field in compact stars, triggered by the observation of magnetars, a new type of "neutron stars" with the superstrong magnetic field. We have shown that there should be a spontaneous magnetization at low densities in quark matter, and indicated that we can explain the superstrong magnetic field if we can regard magnetars as quark stars. We have also emphasized the relativistic aspects of quark ferromagnetism by considering the non-perturbative effects. Less

l）由于手性对称性，在神经元和温度的存在下，由于kaon凝结而导致的protoneutron恒星延迟崩溃的可能性已经提出了一种新的kaon冷凝公式，并基于手性对称性得出了状态方程（EOS）。使用此EOS，我们系统地检查了原子星的平衡结构，并详细讨论了其特性作为熵和Lepton数字的功能。然后，我们讨论了由于KAON凝结的发生和EOS在热演化过程中的大量软化而导致protoneutron恒星延迟崩溃的可能性。结果，我们已经显示了中性捕获效应的重要性，尚未强调。我们还通过将我们的结果与其他论文中给出的结果进行比较，阐明了手性模型的特定特征。我们的结果已经在期刊上发表，也在国际会议上进行了报道。2）超声事物和超子超流量……更多地y，从超核中的研究中获得的现实型超元素和 - 努核的相互作用，我们已经研究了高密度核事物中的超子混合的问题，并可能具有高密度核物质和超级超丰富性的可能性。结果，我们提出，通过考虑EOS的急剧软化和中子星的观察质量，应在超声物质中产生其他排斥作用。至于超子超流体，我们得出的结论是，诸如λ，σ^ - ，ξ^ - 应该显示超流体。3）Quark Matter的铁磁性我们研究了核物质和夸克物质的铁磁性的可能性，是紧凑型恒星中磁场的起源，并触发了Magnetars septress obs obs new类型的磁场，是一种新型类型，是一种新的类型。我们已经表明，在夸克物质中低密度下应该有一个赞助磁化，并表明如果我们可以将磁力关注为夸克恒星，我们可以解释superstrong磁场。我们还通过考虑非扰动效应来强调夸克铁磁性的相对论方面。较少的