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arXiv 1503.05333hep-phhep-thnucl-th
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背景场中关联函数的格线表示

Lattice worldline representation of correlators in a background field

Thomas Epelbaum, Francois Gelis, Bin Wu

摘要:

本文利用离散世界线表示研究了背景场中二维四局部算子单圈期望值的连续极限。我们说明这种技术的情况下,一个标量场耦合到一个非阿贝尔背景规范场。前两个系数的展开在幂的晶格间距可以表示为总和随机游走在d维立方晶格。利用格上闭随机游动面积分布的组合恒等式,这些系数可以转化为简单的积分。我们的结果是有效的各向异性晶格,在每个方向上的任意晶格间距。

英文摘要:

We use a discrete worldline representation in order to study the continuum limit of the one-loop expectation value of dimension two and four local operators in a background field. We illustrate this technique in the case of a scalar field coupled to a non-Abelian background gauge field. The first two coefficients of the expansion in powers of the lattice spacing can be expressed as sums over random walks on a d-dimensional cubic lattice. Using combinatorial identities for the distribution of the areas of closed random walks on a lattice, these coefficients can be turned into simple integrals. Our results are valid for an anisotropic lattice, with arbitrary lattice spacings in each direction.

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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