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arXiv 0812.2797hep-lathep-th
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有限体积中的手征凝聚

The Chiral Condensate in a Finite Volume

Poul H. Damgaard, Hidenori Fukaya

摘要:

本文重新考虑了有限四体积V(=L^3T)的手征微扰理论,以期找到一个能处理任意M_πL值的计算方案,其中M_π是一般的南武-戈德斯通质量。动量零模式,导致通常的p-膨胀失败的手征极限分别处理,并部分集成到所有的订单。这样,理论在微扰展开中保持红外有限,手征极限可以考虑在有限体积。我们通过计算有限体积中的夸克凝聚来说明该技术,将较大质量的p-制度中的标准结果与较小质量的ε-制度中的标准结果顺利地连接起来。从部分猝灭理论,我们还获得了狄拉克算子的谱密度,从微观区域的p-制度的体区域的光滑函数。

英文摘要:

Chiral perturbation theory at finite four-volume V (=L^3T) is reconsidered with a view towards finding a computational scheme that can deal with any value of M_πL, where M_πis a generic Nambu-Goldstone mass. The momentum zero modes that cause the usual p-expansion to fail in the chiral limit are treated separately, and partly integrated out to all orders. In this way the theory remains infrared finite in the perturbative expansion, and the chiral limit can be considered at finite volume. We illustrate the technique by computing the quark condensate in a finite volume, smoothly connecting standard results in the p-regime for larger masses with those of the epsilon-regime for smaller masses. From the partially quenched theory we also obtain the spectral density of the Dirac operator, a smooth function from the microscopic region to the bulk region of the p-regime.

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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