Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-03-18
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, LaTeX, CCNY-HEP-94-6 Invited contribution to the Marshak Memorial volume, edited by E.C.G. Sudarshan, to be publishe
Scientific paper
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.
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