Is the Electroweak theory chiral regardless of temperature?

Is the electroweak theory a chiral theory regardless of whether one is above the electroweak symmetry breaking temperature or not?

• Yes, it breaks chiral symmetry explicitly and thus this symmetry is never restored at high-energy – innisfree Dec 4 '15 at 13:05

1 Answer

Yes, the SM is chiral regardless of temperature. Parity is broken explicitly (not spontaneously) and thus this symmetry is never restored at high temperatures.

There are howere left-right symmetric extensions of the SM, in which parity is indeed broken spontaneously at low energies and would be restored at high temperature.