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Quark Degree of Freedom and Meson Fields in Baryon Many-Body System

重子多体系统中的夸克自由度和介子场

基本信息

批准号：
61540205
负责人：
TAMAGAKI Ryozo
金额：
$ 0.64万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61540205/
关键词：
Baryon Quark degree of freedom Meson Skyrmion Chiral bag Nuclear force Meson condensation 中性子星

项目摘要

1. On the baryon structure and nuclear force - (1) Treating the SU(3)v breaking in the SU(3) X SU(3) Skyrme model exactly within the collective coordinate method, we have found that our method is effective especially to explain the mass splitting among baryon multiplets. (2) As for the chiral bag model, we studied how the framework constructed for only pion case works well once system is generalized to include other mesons, e.g. <omega>mesons, and found that the Casimir effects inside the bag are important also in this case. (3) We studied the problem of nuclear force with the use of the chiral bag model. A schematic model has been treated exactly for interactin between two quark layers and now our formalism is extended to study realistic baryon-baryon interaction.2. On the phases in high-density nuclear matter - (1) We have examined equation of state for quark matter including heavy quarks and found that quark stars are gravitationally unstable due to the asymptotic freedom of QCD. (2) As for the neutral pion condensation in hot symmetric nuclear matter, a Hartree-Fock calculation with an effective interaction has been done by including <DELTA> (1232), and its relevance to the phenomena during highenergy H.I.collisions has been discussed. (3) As for the combined condensation of neutral and charged pions, a chiral symmetry approach with realistic effects such as isobars and baryon-baryon short-range correlations have been taken, and we studied interior structure and the cooling problem of neutron stars. Moreover, relation between <pi>-condensed neutron stars and glitch phenomena has been discussed and a new mechanism to explain those in Vela and Cleb pulsars has been proposed. (4) Problem of K-on condensation has been examined and its effects on the cooling of neutron stars have been discussed.

1.关于重子结构和核力：（1）用集体坐标方法处理SU（3）× SU（3）Skyrme模型中的SU（3）v破缺，发现我们的方法特别适用于解释重子多重态间的质量分裂。(2)对于手征袋模型，我们研究了当系统推广到包括其他介子（例如介子）时，仅为π介子情况构建的框架如何工作<omega>，并发现袋内的Casimir效应在这种情况下也很重要。(3)本文利用手征袋模型研究了核力问题。我们已经精确地处理子两夸克层间相互作用的示意模型，现在我们的形式被推广到研究实际的重子-重子相互作用.关于高密度核物质中的位相：（1）我们考察了包括重夸克在内的夸克物质的状态方程，发现由于QCD的渐近自由，夸克星是引力不稳定的。(2)对于热对称核物质中的中性π介子凝聚，我们采用包含（1232）的有效相互作用进行了Hartree-Fock计算<DELTA>，并讨论了它与高能H.I.碰撞现象的关系. (3)对于中性π介子和带电π介子的组合凝聚，我们采用手征对称性方法，结合同量异位素和重子-重子短程关联等实际效应，研究了中子星的内部结构和冷却问题。此外，<pi>还讨论了非凝聚中子星与毛刺现象的关系，并提出了一种新的机制来解释船帆座和克莱布座的毛刺现象。(4)本文研究了K-on凝聚问题，讨论了它对中子星冷却的影响。