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arXiv 1005.1882hep-phastro-ph.SR
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电中性和矢量相互作用诱导的手征相变的多临界点结构

Multiple critical point structure for chiral phase transition induced by charge neutrality and vector interaction

Zhao Zhang, Teiji Kunihiro

摘要:

在中性色超导的基础上,研究了排斥矢量相互作用和正化学势对手征相变的联合作用。在荷中性约束下,在2 + 1味Nambu-Jona-Lasinio模型中,采用Kobayashi-Maskawa-'t Hooft项,得到了手征凝聚、双夸克凝聚和夸克数密度.我们证明了在自洽平均场近似下Nambu-Jona-Lasinio模型中总是存在多个手征临界点结构,并且手征临界点的数目可以从0到4不等,这取决于矢量相互作用和双夸克耦合的大小.

英文摘要:

The combined effect of the repulsive vector interaction and the positive electric chemical potential on the chiral phase transition is investigated by considering neutral color superconductivity. Under the charge-neutrality constraint, the chiral condensate, diquark condensate and quark number densities are obtained in two-plus-one-flavor Nambu-Jona-Lasinio model with the so called Kobayashi-Maskawa-'t Hooft term. We demonstrate that multiple chiral critical-point structures always exist in the Nambu-Jona-Lasinio model within the self-consistent mean-field approximation, and that the number of chiral critical points can vary from zero to four, which is dependent on the magnitudes of vector interaction and the diquark coupling.

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