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arXiv 1505.04498hep-thhep-lathep-ph
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用全息术研究有限温度QCD中的瞬子动力学

Instanton dynamics in finite temperature QCD via holography

Masanori Hanada, Yoshinori Matsuo, Takeshi Morita

摘要:

我们利用Witten的全息QCD研究了有限温度QCD中的瞬子。为了研究去限制阶段,我们使用[1](arXiv:1107.4048)中提出的设置。我们发现,在禁闭和解除禁闭阶段,瞬子的大小都稳定在一定的值。这与格点规范理论的数值结果一致。此外,我们还发现大瞬子和小瞬子在退禁闭阶段的引力场具有不同的拓扑结构。我们还指出,在禁闭阶段拓扑荷的涨落较大,而在解除禁闭阶段拓扑荷的涨落被指数抑制,并且在Gross-Witten-Wadia(GWW)点发生连续跃迁.在格点量子色动力学中,由于GWW点可能停留在不稳定的分支上,因此很难观察到这种跃迁的对应物。

英文摘要:

We investigate instantons in finite temperature QCD via Witten's holographic QCD. To study the deconfinement phase, we use the setup proposed in [1] (arXiv:1107.4048). We find that the sizes of the instantons are stabilized at certain values both in the confinement and deconfinement phases. This agrees with the numerical result in the lattice gauge theory. Besides we find that the gravity duals of the large and small instantons in the deconfinement phase have different topologies. We also argue that the fluctuation of the topological charges is large in confinement phase while it is exponentially suppressed in deconfinement phase, and a continuous transition occurs at the Gross-Witten-Wadia (GWW) point. It would be difficult to observe the counterpart of this transition in lattice QCD, since the GWW point in QCD may stay at an unstable branch.

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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