Chiral Morphing
  Chiral symmetry undergoes a metamorphosis at $T_c$.   For $T < T_c$, the usual Noether charge, $\Qa$, is dynamically broken by the vacuum. Above $T_c$, chiral symmetry undergoes a subtle change, and the Noether charge \underline{{\em morphs}} into $\Qbeta$, with the thermal vacuum now becoming invariant under $\Qbeta$.   This vacuum is however not invariant under the old $\Qa$ transformations.   As a result, the pion remains strictly massless at high $T$.   The pion propagates in the early universe with a halo.   New order parameters are proposed to probe the structure of the new thermal vacuum. 
Ngee Pong Chang