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arXiv 1012.5855hep-ph
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Polyakov环在手征相变中的作用

The effect of the Polyakov loop on the chiral phase transition

G. Marko, Zs. Szep

摘要:

在SU(2)_L × SU(2)_R手征夸克-介子模型中,通过考虑耦合到(sigma,pi)介子多重态的组分夸克在时间规范场的均匀背景上的传播,引入了Polyakov环.在有限温度和夸克重子化学势的条件下,利用味数N_f的展开式,在手征极限和π介子质量的物理值下求解了模型。保持费米子传播子在树水平上,构造了一个π传播子的重算,它在1/N_f中求和无穷多个阶,其中O(1/N_f)表示费米子在π传播子中开始贡献的阶.本文研究了不同形式的Polyakov回线势对mu_q-T相图中三临界点或临界点的影响。

英文摘要:

The Polyakov loop is included in the SU(2)_L x SU(2)_R chiral quark-meson model by considering the propagation of the constituent quarks, coupled to the (sigma,pi) meson multiplet, on the homogeneous background of a temporal gauge field, diagonal in color space. The model is solved at finite temperature and quark baryon chemical potential both in the chiral limit and for the physical value of the pion mass by using an expansion in the number of flavors N_f. Keeping the fermion propagator at its tree-level, a resummation on the pion propagator is constructed which resums infinitely many orders in 1/N_f, where O(1/N_f) represents the order at which the fermions start to contribute in the pion propagator. The influence of the Polyakov loop on the tricritical or the critical point in the mu_q-T phase diagram is studied for various forms of the Polyakov loop potential.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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