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Superluminal pions in a hadronic fluid

Neven Bilic, Hrvoje Nikolic

hep-pharXiv:hep-ph/0301275

Abstract

We study the propagation of pions at finite temperature and finite chemical potential in the framework of the linear sigma model with 2 quark flavors and Nc colors. The velocity of massless pions in general differs from that of light. One-loop calculations show that in the chiral symmetry broken phase pions, under certain conditions, propagate faster than light.

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