1994/03/18 by Ngee Pong Chang, Chang, Ngee Pong
Physics and Astronomy · #Origins and Evolution of Life
paper · pdf · doi:10.48550/arxiv.hep-ph/9403309
Chiral symmetry undergoes a metamorphosis at Tc. For T < Tc, the usual Noether charge, \Qa, is dynamically broken by the vacuum. Above Tc, 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.