Fermi spectra and their gauge invariance in hot and dense Abelian and non-Abelian theories

Abstract

The one-loop Fermi spectra (one-particle and collective ones) are found for all momenta in the $T^2$-approximation and their gauge invariance in hot and dense Abelian and non-Abelian theories is studied. It is shown that the one-particle spectrum, if the calculation accuracy is kept strictly, is gauge invariant for all momenta and has two branches as the bare one. The collective spectrum always has four branches which are gauge dependent including also their $|\q|=0$ limit. The exception is the case $m,\mu =0$ for which this spectrum is gauge invariant for all momenta as well.

16 pages, latex, no figures

References in corpus (2)

• The Perturbative Pole Mass in QCD
• One-particle and collective electron spectra in hot and dense QED and their gauge dependence

Cited by in corpus (4)

• Advances in perturbative thermal field theory
• Resonant Relaxation in Electroweak Baryogenesis
• Structure of the Quark Propagator at High Temperature
• Probing Physics in the Standard Model and Beyond with Electroweak Baryogenesis and Effective Theories of the Strong Interactions