Propagation of Cool Pions
High Energy Physics - Phenomenology
2010-01-06 v2 Nuclear Theory
Abstract
For an exact chiral symmetry which is spontaneously broken at zero temperature, we show that at nonzero temperature, generally pions travel at {\it less} than the speed of light. This effect first appears at next to leading order in an expansion about low temperature. When the chiral symmetry is approximate we obtain two formulas, like that of Gell-Mann, Oakes, and Renner, for the static and dynamic pion masses.
Cite
@article{arxiv.hep-ph/9604404,
title = {Propagation of Cool Pions},
author = {Robert D. Pisarski and Michel Tytgat},
journal= {arXiv preprint arXiv:hep-ph/9604404},
year = {2010}
}
Comments
5 pages, using revtex. References added. Version to appear in Phys. Rev. D