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arXiv 1102.2779hep-ph
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手征相变和真空涨落的作用

The chiral phase transition and the role of vacuum fluctuations

Jens O. Andersen, Rashid Khan, Lars T. Kyllingstad

摘要:

在有限温度T和夸克化学势μ下,我们将优化微扰理论应用于夸克-介子模型。计算了手征极限和物理点处的有效势,并用于研究双味QCD的手征动力学。临界温度和相变的顺序在很大程度上取决于有效势中是否包含玻色子和费米子真空涨落。一个完整的单循环计算的手征极限预测一阶过渡的所有值的μ。在物理点处,在整个$μ-T$平面中发现交叉。

英文摘要:

We apply optimized perturbation theory to the quark-meson model at finite temperature T and quark chemical potential mu. The effective potential is calculated to one loop both in the chiral limit and at the physical point and used to study the chiral dynamics of two-flavor QCD. The critical temperature and the order of the phase transition depends heavily on whether or not one includes the bosonic and fermionic vacuum fluctuations in the effective potential. A full one-loop calculation in the chiral limit predicts a first-order transition for all values of mu. At the physical point, one finds a crossover in the whole $μ-T$ plane.

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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