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arXiv 0910.5785hep-lat
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格点规范理论中的Dyson不稳定性

Dyson's Instability in Lattice Gauge Theory

A. Bazavov, A. Denbleyker, Daping Du, Y. Meurice, A. Velytsky, Haiyuan Zou

摘要:

我们在格点规范理论的背景下讨论了Dyson关于真空在变化g^2 -> - g^2下不稳定的论证。对于紧致规范群,配分函数在负g^2处定义良好,但当g^2改变符号时,平均元格P具有不连续性。这反映了真空的变化而不是真空的损失。此外,P在复g^2平面上有极点,位于配分函数的复零点(费舍尔零点)。我们讨论了晶格微扰理论的这些奇异性的相关性。本文提出了利用SU(2)和U(1)纯规范理论中态密度的数值来定位Fisher零点的新方法。我们简要地讨论了O(N)非线性西格玛模型的局部积分也紧空间上的类似问题。

英文摘要:

We discuss Dyson's argument that the vacuum is unstable under a change g^2 -> - g^2, in the context of lattice gauge theory. For compact gauge groups, the partition function is well defined at negative g^2, but the average plaquette P has a discontinuity when g^2 changes sign. This reflects a change of vacuum rather than a loss of vacuum. In addition, P has poles in the complex g^2 plane, located at the complex zeros of the partition function (Fisher's zeros). We discuss the relevance of these singularities for lattice perturbation theory. We present new methods to locate Fisher's zeros using numerical values for the density of state in SU(2) and U(1) pure gauge theory. We briefly discuss similar issues for O(N) nonlinear sigma models where the local integrals are also over compact spaces.

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