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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）K介子凝聚导致质子中子星延迟坍缩的可能性我们提出了一种新的K介子凝聚的形式，并根据手征对称性导出了状态方程。利用这个状态方程，我们系统地研究了质子中子星的平衡结构，并详细讨论了它作为熵和轻子数的函数的性质。讨论了质子中子星在热演化过程中由于K介子凝聚和物态方程大幅度软化而延迟坍缩的可能性。结果表明了中微子俘获效应的重要性，而这一点至今还没有引起人们的重视。我们还澄清了手征模型的具体特点，通过比较我们的结果与其他文件中给出的。我们的研究结果已在国际学术会议上发表和发表。2）超子物质和超子超流 ...更多信息利用超核研究中得到的实际超子-超子和-核子相互作用，研究了高密度核物质中超子混合问题和超子超流性的可能性。考虑到物态方程的急剧软化和中子星的观测质量，我们认为在超子物质中应该存在额外的排斥效应。3）夸克物质的铁磁性我们通过对磁星（一种具有超强磁场的新型“中子星”）的观测，研究了核物质和夸克物质的铁磁性作为致密星磁场起源的可能性。我们证明了夸克物质在低密度时应该存在自发磁化，并指出如果把磁星看作夸克星，我们就可以解释超强磁场。我们还强调了夸克铁磁性的相对论方面考虑的非微扰效应。少