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arXiv 0809.5015hep-lat
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Orientifold平面等价:手性凝聚体

Orientifold Planar Equivalence: The Chiral Condensate

Adi Armoni, Biagio Lucini, Agostino Patella, Claudio Pica

摘要:

最近引入的定向折叠平面等价是解决QCD非微扰问题的一个很有前途的工具。定向折叠平面等价的预言之一是,对称(或反对称)表象中狄拉克费米子的$N_f$味和伴随表象中马约拉纳费米子的$N_f$味的理论的手征凝聚,对于任何(简并)费米子的质量值,都具有相同的大$N$值。假设电荷共轭下的理论不变性,我们证明了这一说法的交错淬火凝聚在SU($N$)Yang-Mills在大$N$限制的晶格。然后,我们数值计算那些淬火凝聚$N$高达8。在分离了$1/N$中的偶数和奇数修正后,我们能够证明我们的数据支持等价性;然而,与其他猝灭观测量不同,$1/N$中的子前导项需要用于描述$N$ =3时的对称和反对称表示的数据。未淬火的情况下可能的教训进行了讨论。

英文摘要:

The recently introduced orientifold planar equivalence is a promising tool for solving non-perturbative problems in QCD. One of the predictions of orientifold planar equivalence is that the chiral condensates of a theory with $N_f$ flavours of Dirac fermions in the symmetric (or antisymmetric) representation and $N_f$ flavours of Majorana fermions in the adjoint representation have the same large $N$ value for any value of the mass of the (degenerate) fermions. Assuming the invariance of the theory under charge conjugation, we prove this statement on the lattice for staggered quenched condensates in SU($N$) Yang-Mills in the large $N$ limit. Then, we compute numerically those quenched condensates for $N$ up to 8. After separating the even from the odd corrections in $1/N$, we are able to show that our data support the equivalence; however, unlike other quenched observables, subleading terms in $1/N$ are needed for describing the data for the symmetric and antisymmetric representation at $N$=3. Possible lessons for the unquenched case are discussed.

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