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arXiv 0812.3617hep-thhep-lat
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中心对称与定向折叠平面等价

Center symmetry and the orientifold planar equivalence

Luigi Del Debbio, Agostino Patella

摘要:

通过计算格点上大质量展开中Polyakov圈的有效势,研究了SU(N)规范理论的中心对称性。在大N极限和非零温度下,我们发现在伴随表象中费米子的中心对称性为Z_N,而在(反)对称表象中费米子的中心对称性为Z_2。我们讨论的事实是,我们的结果并不矛盾的orientifold平面等价,这涉及到一个共同的部门所定义的玻色子规范不变的C-甚至国家的理论与费米子在不同的两个指数表示。我们的结果补充了Armoni等人(2007)的工作,他们通过考虑有限温度下的理论,证明了在零温度下,费米子在(反对称)表示中的Z_N中心对称性是如何动态恢复的。

英文摘要:

We study the center symmetry of SU(N) gauge theories with fermions in the two-index representations, by computing the effective potential of the Polyakov loop in the large-mass expansion on the lattice. In the large-N limit and at non-zero temperature, we find that the center symmetry is Z_N for fermions in the adjoint representation and just Z_2 for fermions in the (anti)symmetric representation. We discuss the fact that our results do not contradict the orientifold planar equivalence, which relates a common sector defined by the bosonic gauge-invariant C-even states of theories with fermions in different two-index representations. Our results complement the work of Armoni et al. (2007), who showed how at zero temperature a Z_N center symmetry is dynamically recovered also for fermions in the (anti)symmetric representation, by considering the theories at finite temperature.

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