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

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

1998-10-10

arxiv.org/abs/hep-ph/9810317v1

Phys.Scripta 60 (1999) 131-138

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, latex, no figures

Scientific paper

10.1088/0031-8949/60/2/005

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.

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