PNJL模型中的平均相位因子
Average phase factor in the PNJL model
摘要：
在有限夸克化学势（μ q）条件下，采用具有标量型八夸克相互作用的Polyakov圈扩展Nambu-Jona-Lasinio（PNJL）模型，计算了QCD行列式的平均相位因子.当μ q大于真空m π时π质量的一半时，只有当Polyakov圈大于0.5时，平均相位因子才是有限的，这表明格点量子色动力学只在退禁闭阶段是可行的.临界终点（CEP）位于零平均相位因子区域。标量型八夸克相互作用使CEP到区域边界的相对距离变短。当μ_q < m_π/2时，考虑介子动力学涨落的PNJL模型能再现临界温度以下的格点量子色动力学数据。
英文摘要：
The average phase factor of the QCD determinant is evaluated at finite quark chemical potential (μ_q) with the two-flavor version of the Polyakov-loop extended Nambu-Jona-Lasinio (PNJL) model with the scalar-type eight-quark interaction. For μ_q larger than half the pion mass at vacuum m_π, the average phase factor is finite only when the Polyakov loop is larger than 0.5, indicating that lattice QCD is feasible only in the deconfinement phase. A critical endpoint (CEP) lies in the region of the zero average phase factor. The scalar-type eight-quark interaction makes it shorter a relative distance of the CEP to the boundary of the region. For μ_q < m_π/2, the PNJL model with dynamical mesonic fluctuations can reproduce lattice QCD data below the critical temperature.
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