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arXiv 1301.5344hep-phhep-lat
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Roberge-Weiss转变和't Hooft环

The Roberge-Weiss transition and 't Hooft loops

Kouji Kashiwa, Robert D. Pisarski

摘要:

Robertson和Weiss指出,对于SU(N)规范理论,相变发生在虚夸克化学势的存在下。我们证明了在渐近高温下,当相变为一级时,即使在动力学夸克的情况下,任意Z(N)荷的t Hooft环在相边界处也是很好的。在弱耦合情况下,t Hooft环满足纯胶理论中的Casimir标度,但不满足夸克标度。因为化学势是虚的,所以通常在相变的一侧,相互作用量度是负的。用矩阵模型模拟退凝相变,计算了重夸克在温度和虚化学势平面上的相图。一般来说,我们发现交叉线的一阶过渡。使用修改后的Polyakov回路是Roberge-Weiss对称的,我们建议,界面张力是有关的't Hooft回路只有在高温下,这个Polyakov回路的虚部,而不是实部,是不连续的相边界。

英文摘要:

Roberge and Weiss showed that for SU(N) gauge theories, phase transitions occur in the presence of an imaginary quark chemical potential. We show that at asymptotically high temperature, where the phase transition is of first order, that even with dynamical quarks 't Hooft loops of arbitrary Z(N) charge are well defined at the phase boundary. To leading order in weak coupling, the 't Hooft loop satisfies Casimir scaling in the pure glue theory, but not with quarks. Because the chemical potential is imaginary, typically the interaction measure is negative on one side of the phase transition. Using a matrix model to model the deconfining phase transition, we compute the phase diagram for heavy quarks, in the plane of temperature and imaginary chemical potential. In general we find intersecting lines of first order transitions. Using a modified Polyakov loop which is Roberge-Weiss symmetric, we suggest that the interface tension is related to the 't Hooft loop only at high temperature, where the imaginary part of this Polyakov loop, and not the real part, is discontinuous across the phase boundary.

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