Zero mode in a strongly coupled quark gluon plasma

Zero mode in a strongly coupled quark gluon plasma
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强耦合夸克胶子等离子体中的零模式

DOI:
10.1103/physrevd.89.076009
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发表时间:
2014-01
期刊:
Physical Review D - Particles, Fields, Gravitation and Cosmology
影响因子:
--
通讯作者:
Schmidt, Sebastian M.
Schmidt, Sebastian M.
中科院分区:
其他
文献类型:
--
作者:
Qin, Si-Xue;Liu, Yu-Xin;Roberts, Craig D.;Schmidt, Sebastian M.

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结合无质量双味 QCD,我们使用三个不同的胶子-夸克顶点和关于夸克-夸克相互作用的长程部分的两个不同假设来分析恢复相变的手性对称性。在每种情况下,我们求解间隙方程,定位转变温度 T_c,并使用最大熵方法提取 T>T_c 处的修饰夸克谱函数。我们对手性转变温度的最佳估计是 T_c=(147 +/- 8)MeV;和解禁过渡是重合的。对于明显高于 T_c 的温度,我们发现光谱密度与使用硬热循环膨胀产生的光谱密度一致,表现出正常模式和纤溶酶模式。然而,在域 T\in[T_c,T_s] 上,T_s 约为 1.5T_c,对于我们考虑的六个内核中的每一个,谱函数都包含一个重要的附加特征。即,它显示与零模式相关的第三个峰值,其本质上是非微扰的并且在T=T_c处主导谱函数。我们认为这种模式的存在是形成强耦合夸克-胶子等离子体的信号,并且这种强相互作用的物质状态可能是 QCD 相变的一个显着特征。
In connection with massless two-flavour QCD, we analyse the chiral symmetry restoring phase transition using three distinct gluon-quark vertices and two different assumptions about the long-range part of the quark-quark interaction. In each case, we solve the gap equation, locate the transition temperature T_c, and use the maximum entropy method to extract the dressed-quark spectral function at T>T_c. Our best estimate for the chiral transition temperature is T_c=(147 +/- 8)MeV; and the deconfinement transition is coincident. For temperatures markedly above T_c, we find a spectral density that is consistent with those produced using a hard thermal loop expansion, exhibiting both a normal and plasmino mode. On a domain T\in[T_c,T_s], with T_s approximately 1.5T_c, however, with each of the six kernels we considered, the spectral function contains a significant additional feature. Namely, it displays a third peak, associated with a zero mode, which is essentially nonperturbative in origin and dominates the spectral function at T=T_c. We suggest that the existence of this mode is a signal for the formation of a strongly-coupled quark-gluon plasma and that this strongly-interacting state of matter is likely a distinctive feature of the QCD phase transition.
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