arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1102.5531hep-lat
收藏

QCD限制和手性交叉,两个临界点

QCD confinement and chiral crossovers, two critical points

P. Bicudo, M. Cardoso, N. Cardoso

摘要:

我们研究了QCD相图,特别是研究了两个主要的QCD相变,禁闭和手征对称性破缺的临界点。禁闭驱动手征对称性破缺,并且,由于有限的夸克质量,在小密度下两个跃迁是交叉,而在大密度下它们是一级或二级相变。我们研究了同时考虑禁闭和手征对称性的夸克势模型下的QCD相图。我们给出了在SU(3)猝灭格点量子色动力学中得到的夸克场在通量管中的禁闭,以说明禁闭夸克-反夸克势的重要性。我们的有限温度约束势是从Bielefeld群的格点量子色动力学数据中提取的。我们的形式,QCD的库仑规范哈密顿量,是目前唯一一个能够微观包括夸克-反夸克禁闭势和真空凝聚的夸克-反夸克对。这个模型能够同时处理所有的激发强子和手征对称性破缺。我们的序参量是Polyakov圈和夸克质量隙。我们解决夸克质量如何影响相图中的临界点位置。

英文摘要:

We study the QCD phase diagram, in particular we study the critical points of the two main QCD phase transitions, confinement and chiral symmetry breaking. Confinement drives chiral symmetry breaking, and, due to the finite quark mass, at small density both transitions are a crossover, while they are a first or second order phase transition in large density. We study the QCD phase diagram with a quark potential model including both confinement and chiral symmetry. We present the confinement of quark fields into a flux tube, obtained in SU(3) quenched lattice QCD, to illustrate the importance of the confining quark-antiquark potential. Our finite temperature con-fining potential is extracted from the Lattice QCD data of the Bielefeld group. Our formalism, the Coulomb gauge hamiltonian of QCD, is presently the only one able to microscopically include both a quark-antiquark confining potential and a vacuum condensate of quark-antiquark pairs. This model is able to address all the excited hadrons, and chiral symmetry breaking, at the same token. Our order parameters are the Polyakov loop and the quark mass gap. We address how the quark masses affect the critical point location in the phase diagram.

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。

↑