Real-time thermal field theory analyses of 2D Gross-Neveu model

TL;DR

This paper uses real-time thermal field theory to analyze symmetry breaking and restoration in the 2D Gross-Neveu model, demonstrating equivalences with other methods and revealing detailed phase transition behavior.

Contribution

It provides a real-time thermal field theory analysis of the 2D Gross-Neveu model, showing equivalence with imaginary-time methods and detailed phase transition insights.

Findings

Critical temperature T_c=0.567 m(0) is reproduced.

Dynamical fermion mass m is scale-independent.

Second-order phase transition behavior is indicated.

Abstract

Discrete symmetry breaking and possible restoration at finite temperature $T$ are analysed in 2D Gross-Neveu model by the real-time thermal field theory in the fermion bubble approximation. The dynamical fermion mass $m$ is proven to be scale-independent and this fact indicates the equivalence between the fermion bubble diagram approximation and the mean field approximation used in the auxialiary scalar field approach. Reproducing of the non-zero critical temperature $T_c=0.567 m(0)$, ($m(0)$ is the dynamical fermion mass at T=0), shows the equivalence between the real-time and the imaginary-time thermal field theory in this problem. However, in the real-time formalism, more results including absence of scalar bound state, the equation of criticality curve of chemical potential-temperature and the $\ln(T_c/T)$ behavior of $m^2$ at $T\stackrel{<}{\sim} T_c$ can be easily obtained. The last one indicates the second-order phase transition feature of the symmetry restoration.