Chiral Morphing
Abstract
Description
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.
14 pages, LaTeX, CCNY-HEP-94-6 Invited contribution to the Marshak Memorial volume, edited by E.C.G. Sudarshan, to be published by World Scientific Publishing Co., Singapore, 1994. **** Earlier version had email bug due to transmission problem
14 pages, LaTeX, CCNY-HEP-94-6 Invited contribution to the Marshak Memorial volume, edited by E.C.G. Sudarshan, to be published by World Scientific Publishing Co., Singapore, 1994. **** Earlier version had email bug due to transmission problem