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arXiv 1107.4048hep-thhep-lathep-ph
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全息QCD中的限制/解除限制跃迁

Gregory-Laflamme as the confinement/deconfinement transition in holographic QCD

Gautam Mandal, Takeshi Morita

摘要:

我们讨论的相位结构的N D 4膜包裹在一个时间(欧几里德)和一个空间圆,在近地平线AdS几何。这个系统以前已经研究过,通过全息术来理解四维纯SU(N)Yang-Mills理论(YM 4)。在通常的治疗的主题,之间的相变的AdS孤子和黑色的D4膜被解释为强耦合的延续YM 4中的限制/解除限制过渡。我们证明了这种解释是不正确的,因为黑D4膜和YM 4的去禁闭相具有不同的Z_N中心对称性实现,并且不能被识别。我们提出了一个替代的引力对偶的约束/解除禁闭过渡的Gregory-Laflamme过渡的AdS孤子在IIB框架,其中强耦合的YM 4解除禁闭阶段的延续是一个本地化的D3孤子。我们的建议提供了一个新的解释全息QCD热力学的几个方面。作为一个例子,我们展示了Sakai-Sugimoto模型中手征对称性恢复的新机制。本文所讨论的问题一般涉及非超对称规范理论的引力理论。

英文摘要:

We discuss the phase structure of N D4 branes wrapped on a temporal (Euclidean) and a spatial circle, in terms of the near-horizon AdS geometries. This system has been studied previously to understand four dimensional pure SU(N) Yang-Mills theory (YM4) through holography. In the usual treatment of the subject, the phase transition between the AdS soliton and the black D4 brane is interpreted as the strong coupling continuation of the confinement/deconfinement transition in YM4. We show that this interpretation is not valid, since the black D4 brane and the deconfinement phase of YM4 have different realizations of the Z_N centre symmetry and cannot be identified. We propose an alternative gravity dual of the confinement/deconfinement transition in terms of a Gregory-Laflamme transition of the AdS soliton in the IIB frame, where the strong coupling continuation of the deconfinement phase of YM4 is a localized D3 soliton. Our proposal offers a new explanation of several aspects of the thermodynamics of holographic QCD. As an example, we show a new mechanism of chiral symmetry restoration in the Sakai-Sugimoto model. The issues discussed in this paper pertain to gravity duals of non-supersymmetric gauge theories in general.

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