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Lattice worldline representation of correlators in a background field

Abstract : 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.
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https://hal-cea.archives-ouvertes.fr/cea-01280202
Contributor : Emmanuelle de Laborderie <>
Submitted on : Monday, February 29, 2016 - 10:50:22 AM
Last modification on : Thursday, June 18, 2020 - 12:58:24 PM
Long-term archiving on: : Monday, May 30, 2016 - 3:13:45 PM

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1504.00314v2.pdf
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  • HAL Id : cea-01280202, version 1
  • ARXIV : 1503.05333

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Thomas Epelbaum, François Gelis, Bin Wu. Lattice worldline representation of correlators in a background field. 2016. ⟨cea-01280202⟩

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