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Lattice worldline representation of correlators in a background field

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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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Dates and versions

cea-01280202 , version 1 (29-02-2016)

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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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