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arXiv 1610.09288hep-lat
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强耦合格点量子色动力学中Polyakov圈对phase diagram的影响

Polyakov loop effects on the phase diagram in strong-coupling lattice QCD

Kohtaroh Miura, Noboru Kawamoto, Takashi Z. Nakano, Akira Ohnishi

摘要:

利用含一种无根交错夸克的格点量子色动力学(SC-LQCD)的强耦合(1/g^2)展开,研究了包含O}(1/g^4)效应的Polyakov圈对QCD相图的影响.我们在韦斯平均场近似(MFA)中考虑了波利亚科夫环波动的影响,并将结果与哈尔测度MFA(没有平均场波动)中的结果进行比较。Polyakov环在小化学势下强烈抑制了二阶/交叉区域的手性转变温度,而在较大化学势下,它们对一阶相边界进行了微小的修改。波里雅科夫环也解释了手征相变附近相互作用测度的急剧增加。手性和Polyakov回路亲合性在二阶/交叉区域中具有彼此接近的峰。特别是在Weiss MFA中,没有任何迹象表明在任何化学势下手性相边界的分离的去禁闭过渡边界。我们讨论了手征和解除禁闭动力学之间的相互作用,通过裸夸克质量依赖的磁化率。

英文摘要:

We investigate the Polyakov loop effects on the QCD phase diagram by using the strong-coupling (1/g^2) expansion of the lattice QCD (SC-LQCD) with one species of unrooted staggered quark, including O}(1/g^4) effects. We take account of the effects of Polyakov loop fluctuations in Weiss mean-field approximation (MFA), and compare the results with those in the Haar-measure MFA (no fluctuation from the mean-field). The Polyakov loops strongly suppress the chiral transition temperature in the second-order/crossover region at small chemical potential, while they give a minor modification of the first-order phase boundary at larger chemical potential. The Polyakov loops also account for a drastic increase of the interaction measure near the chiral phase transition. The chiral and Polyakov loop susceptibilities have their peaks close to each other in the second-order/crossover region. In particular in Weiss MFA, there is no indication of the separated deconfinement transition boundary from the chiral phase boundary at any chemical potential. We discuss the interplay between the chiral and deconfinement dynamics via the bare quark mass dependence of susceptibilities.

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