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arXiv 0712.0672hep-thhep-lathep-ph
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定向折叠场论的平面极限与涌现中心对称性

Planar Limit of Orientifold Field Theories and Emergent Center Symmetry

Adi Armoni, Mikhail Shifman, Mithat Unsal

摘要:

我们考虑R3 xS 1上的orientifold场论(即SU(N)Yang-Mills理论,费米子在双指数对称或反对称表示中),其中紧维可以是时间的也可以是空间的。这些理论在平面上等价于超对称杨-米尔斯理论。后者具有Z_N中心对称性。著名的Polyakov判据将约束-解除约束的相变定义为从Z_N对称到Z_N破缺的相变。在拉格朗日层次上,东方褶皱理论至多有一个Z_2中心.讨论了在N->无穷大的极限下,全Z_N中心对称性是如何在定向折叠理论中动态出现的.在限制阶段,这种增强的表现是存在稳定的k弦在大N限制的orientifold理论。这些弦与超对称杨-米尔斯理论的弦是相同的。我们认为,临界温度(和其他功能)的限制-解除限制相变是相同的orientifold的女儿和他们的超对称父高达1/N的修正。我们还讨论了四维类QCD理论的Abel和非Abel约束机制。

英文摘要:

We consider orientifold field theories (i.e. SU(N) Yang--Mills theories with fermions in the two-index symmetric or antisymmetric representations) on R3xS1 where the compact dimension can be either temporal or spatial. These theories are planar equivalent to supersymmetric Yang--Mills. The latter has Z_N center symmetry. The famous Polyakov criterion establishing confinement-deconfinement phase transition as that from Z_N symmetric to Z_N broken phase applies. At the Lagrangian level the orientifold theories have at most a Z_2 center. We discuss how the full Z_N center symmetry dynamically emerges in the orientifold theories in the limit N-->infinity. In the confining phase the manifestation of this enhancement is the existence of stable k-strings in the large-N limit of the orientifold theories. These strings are identical to those of supersymmetric Yang--Mills theories. We argue that critical temperatures (and other features) of the confinement-deconfinement phase transition are the same in the orientifold daughters and their supersymmetric parent up to 1/N corrections. We also discuss the Abelian and non-Abelian confining regimes of four-dimensional QCD-like theories.

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