  Pions may remain stable under certain conditions in a dense media at zero
temperature in the normal phase (non pion superfluid state). The stability
condition is achieved when the in-media pion width vanishes. However, thermal
fluctuations will change this stable regime. For low temperature pions will
remain in a metastable state. Here we discuss the different possible scenarios
for leptonic pion decays at finite temperature, taking into account all the
different chemical potentials involved. The neutrino emission due to pions in a
hot-dense media is calculated, as well as the coolig rate of a pion-lepton gas.
