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arXiv 1005.0910hep-phhep-lathep-thnucl-th
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有限重子和同位旋化学势下的QCD phase diagram

QCD phase diagram at finite baryon and isospin chemical potentials

Takahiro Sasaki, Yuji Sakai, Hiroaki Kouno, Masanobu Yahiro

摘要:

利用Polyakov圈扩展的Nambu-Jona-Lasinio(PNJL)模型,研究了具有有限重子化学势μ B和有限同位旋化学势mu_{iso}的热系统的双味QCD相结构.具有标量型八夸克相互作用的PNJL模型不仅能再现mu_{iso} =mu_B=0的格点QCD数据,而且能再现mu_{iso} >0和mu_B=0的格点QCD数据.在mu_{iso} - mu_{B} -T空间中,其中T是温度,当mu_{iso}增加时,在mu_{iso} = 0的mu_B-T平面中的手征相变的临界端点移动到在mu_{iso} -T平面中的π介子-超流相变的三临界点。在小T下的热力学由sqrt{sigma^2+pi^2}控制,该sqrt {sigma^2+pi^2}由手征和π凝聚体sigma和pi定义。

英文摘要:

The phase structure of two-flavor QCD is explored for thermal systems with finite baryon- and isospin-chemical potentials, mu_B and mu_{iso}, by using the Polyakov-loop extended Nambu--Jona-Lasinio (PNJL) model. The PNJL model with the scalar-type eight-quark interaction can reproduce lattice QCD data at not only mu_{iso}=mu_B=0 but also mu_{iso}>0 and mu_B=0. In the mu_{iso}-mu_{B}-T space, where T is temperature, the critical endpoint of the chiral phase transition in the mu_B-T plane at mu_{iso}=0 moves to the tricritical point of the pion-superfluidity phase transition in the mu_{iso}-T plane at mu_B=0 as mu_{iso} increases. The thermodynamics at small T is controlled by sqrt{sigma^2+pi^2} defined by the chiral and pion condensates, sigma and pi.

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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