The Gauged Thirring Model in Thermodynamic Equilibrium

TL;DR

This paper analyzes the Gauged Thirring Model at finite temperature and chemical potential, deriving key equations and showing its relation to Schwinger and Thirring models, advancing understanding of quantum field theories in thermodynamic equilibrium.

Contribution

It develops a formalism for the Gauged Thirring Model at non-zero temperature and chemical potential, deriving exact Green functions and connecting it to related models.

Findings

Derived the partition function and Green functions of the model.

Showed the model's relation to Schwinger and Thirring models.

Analyzed key features like Landau-Khalatnikov transformations.

Abstract

We study the Gauged Thirring Model (also known as Kondo Model) in thermodynamic equilibrium using the Matsubara-Fradkin-Nakanishi formalism. In this formulation, both the temperature and the chemical potential are kept to be nonvanishing. Starting from the field equations, we write down the Dyson-Schwinger-Fradkin equations, the Ward-Fradkin-Takahashi identities, and expressions for the thermodynamical generating functional. We find the partition function of the theory and study some key features of its exact two-point Green Functions, including the Landau-Khalatnikov/Fradkin transformations and some limiting cases of interest as well. In particular, we show that we can recover results from both the Schwinger and the Thirring's models from the Kondo Model in thermodynamic equilibrium.