In a chirally imbalanced medium, ChPT and the linear sigma model agree on growing F_pi and shrinking m_pi, and predict that charged pion decay closes near a chiral chemical potential of about 160 MeV.
Parity violation in hot QCD: Why it can happen , and how to look for it
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Chiral perturbation theory vs. Linear Sigma Model in a chiral imbalance medium
In a chirally imbalanced medium, ChPT and the linear sigma model agree on growing F_pi and shrinking m_pi, and predict that charged pion decay closes near a chiral chemical potential of about 160 MeV.