Green's functions under magnetic effects in a nontrivial topology

TL;DR

This paper derives explicit Bose and Dirac propagators in four-dimensional Euclidean space with magnetic fields, incorporating thermal, finite-volume, and boundary effects analytically without dimensional reduction.

Contribution

It introduces a hybrid Ritus-Schwinger method to compute propagators considering all Landau levels and boundary conditions in a unified analytical framework.

Findings

Explicit propagators in coordinate and momentum space.

Inclusion of thermal and finite-volume effects with boundary conditions.

Elimination of translation non-invariant parts via gauge transformations.

Abstract

We calculate the Bose and Dirac field propagators in a four-dimensional Euclidean space under a magnetic external field by using a hybrid version of the Ritus and Schwinger methods. We get both propagators explicitly in the coordinate and momentum domains without dimensional reduction. Through gauge transformations, we eliminate the translation non-invariant part of the propagators. Also, the Matsubara frequencies of the fields are obtained in a toroidal topology. The approach we consider in this paper has the advantage of taking into account thermal and finite-volume effects with several kinds of boundary conditions, in addition to considering all Landau levels simultaneously, in an analytical and tractable way.