Superluminal pions in a hadronic fluid

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 $N_c$ 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.

8 pages, 3 figures included. Considerably revised, discussions expanded, one figure added, typos corrected, results unchanged. To be published in Phys. Rev. D

References in corpus (3)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Chiral symmetry restoration in linear sigma models with different numbers of quark flavors
• Pion dispersion relation at finite density and temperature

Cited by in corpus (7)

• Weak decay constant of neutral pions in a hot and magnetized quark matter
• Relativistic quantum mechanics and the Bohmian interpretation
• Causal paradoxes: a conflict between relativity and the arrow of time
• Analog geometry in an expanding fluid from AdS/CFT perspective
• Trapped surfaces in a hadronic fluid
• Cosmological particle creation in a hadronic fluid
• Analogue surface gravity near the QCD chiral phase transition