Phys. Rev. D 68, 085008 (2003) [7 pages]Superluminal pions in a hadronic fluidReceived 30 January 2003; published 22 October 2003 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.68.085008
DOI:
10.1103/PhysRevD.68.085008
PACS:
11.10.Wx, 11.30.Rd, 11.55.Fv
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