# Lattice Schwinger Model with interpolated Gauge Fields

## TL;DR

This paper investigates the lattice Schwinger model using interpolated gauge fields, analyzing its effective action, critical points, and chiral condensate, revealing insights into the continuum limit and flavor properties.

## Contribution

It introduces a method for interpolating gauge fields on the lattice and analyzes the model's critical behavior and chiral properties, connecting lattice results to the continuum Schwinger model.

## Key findings

- Identifies a critical point at zero gauge coupling with diverging correlation length.
- Computes the chiral condensate and finds it matches the continuum model for one flavor.
- Discusses operator renormalization needed for the continuum limit.

## Abstract

We analyze the Schwinger model on an infinite lattice using the continuum definition of the fermion determinant and a linear interpolation of the lattice gauge fields. The possible class of interpolations for the gauge fields, compatible with gauge invariance is discussed. The effective action for the lattice gauge field is computed for the Wilson formulation as well as for non-compact lattice gauge fields. For the non-compact formulation we prove that the model has a critical point with diverging correlation length at zero gauge coupling e. We compute the chiral condensate for e > 0 and compare the result to the N-flavor continuum Schwinger model. This indicates that there is only one flavor of fermions with the same chiral properties as in the continuum model, already before the continuum limit is performed. We discuss how operators have to be renormalized in the continuum limit to obtain the continuum Schwinger model.