Symmetry Nonrestoration in the Pati-Salam Model
Abstract
We demonstrate that symmetry need not be restored in the Pati-Salam model, so that SU(2)L SU(2)R SU(4)c remains broken to the Standard Model group at temperatures above the Pati-Salam symmetry breaking scale. Including the leading finite-temperature corrections, suitable quartic couplings prevent a restoration transition, thereby avoiding the thermal production of 't Hooft-Polyakov monopoles after inflation, even if the reheating temperature is very high. This removes monopole-based constraints on the Pati-Salam symmetry breaking scale.
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