Selfconsistent Description of a Thermal Piongas
Nuclear Theory
2009-10-22 v1
Abstract
We examine a hot pion gas by including medium modifications of the two-body scattering amplitude as well as mean-field effects selfconsistently. In contrast to earlier calculations, the in-medium T-matrix is rather close to the free one while the mean-field potential agrees well with lowest-order estimates. We also discuss the validity of the quasiparticle approximation. It is found that it is reliable for temperatures up to MeV. Above this temperature off-shell effects in the pion selfenergy become important, especially if the pions are strongly out of chemical equilibrium.
Cite
@article{arxiv.nucl-th/9306016,
title = {Selfconsistent Description of a Thermal Piongas},
author = {R. Rapp and J. Wambach},
journal= {arXiv preprint arXiv:nucl-th/9306016},
year = {2009}
}
Comments
11 pages, LATEX, 4 figures (not included, available from the authors), KFA-IKP(TH)-1993-18