Cool Pions move at less than the speed of light
Abstract
At nonzero temperature, pions propagate through a thermal medium at less than the speed of light. About low temperature, this effect begins not at $\sim T^2$, but at next to leading order, $\sim T^4$. We also derive the generalization of the relation of GellMann, Oakes, and Renner to nonzero temperature.
 Publication:

arXiv eprints
 Pub Date:
 June 1996
 arXiv:
 arXiv:hepph/9606459
 Bibcode:
 1996hep.ph....6459P
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 11 pages, latex + sprocl.sty, talk given at Continuous Advances in QCD'96, Minneapolis