A new approach to noncompact lattice qed with light fermions

TL;DR

This paper presents detailed simulations of noncompact lattice QED with light fermions, analyzing the effective action and phase diagram to explore the theory's triviality and physical properties.

Contribution

It introduces a novel simulation method incorporating fermionic effects via an effective action and provides new numerical insights into the phase structure of the model.

Findings

Numerical results for plaquette energy and chiral condensate

Analysis of the phase diagram and its qualitative features

Discussion on the triviality of the theory based on effective action properties

Abstract

We discuss detailed simulations of the non compact abelian model coupled to light fermions, using a method previously developed that includes the effects of the fermionic interactions in an effective action. The approximations involved are related to an expansion in the flavour number. We address the problem of the (non) triviality of the theory through a study of the analytical properties of the effective action as a function of the pure gauge energy. New numerical results for the plaquette energy, chiral condensate and a qualitative analysis of the phase diagram are also presented.