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arXiv 0805.2146hep-latcond-mat.stat-mechhep-th
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SU(N)格点规范理论中大N猝灭约化的破缺

Breakdown of large-N quenched reduction in SU(N) lattice gauge theories

Barak Bringoltz, Stephen R. Sharpe

摘要:

本文研究了四维SU(N)格点规范理论与其动量猝灭模型--QEK模型之间的大N等价性。我们发现,等价性证明所需的假设并不自动遵循淬火处方。我们使用弱耦合参数表明,大N等价实际上是可能打破QEK模型,这是由于动态生成的相关性之间的不同的欧几里德分量的规范场。然后,我们使用蒙特卡罗模拟在20 <= N <= 200的中间耦合提供强有力的证据,这些相关性的存在,并为随之而来的故障的减少。这些证据包括在格点规范理论中“体”跃迁的跃迁耦合和QEK模型经历强一阶跃迁的耦合之间的巨大差异。为了准确地测量这种差异,我们适应最近推出的王朗道算法规范理论。

英文摘要:

We study the validity of the large-N equivalence between four-dimensional SU(N) lattice gauge theory and its momentum quenched version--the Quenched Eguchi-Kawai (QEK) model. We find that the assumptions needed for the proofs of equivalence do not automatically follow from the quenching prescription. We use weak-coupling arguments to show that large-N equivalence is in fact likely to break down in the QEK model, and that this is due to dynamically generated correlations between different Euclidean components of the gauge fields. We then use Monte-Carlo simulations at intermediate couplings with 20 <= N <= 200 to provide strong evidence for the presence of these correlations and for the consequent breakdown of reduction. This evidence includes a large discrepancy between the transition coupling of the "bulk" transition in lattice gauge theories and the coupling at which the QEK model goes through a strongly first-order transition. To accurately measure this discrepancy we adapt the recently introduced Wang-Landau algorithm to gauge theories.

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