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arXiv · 2601.14580

Symmetry Nonrestoration in the Pati-Salam Model

N. Okada·A. Stern
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Abstract

We demonstrate that symmetry need not be restored in the Pati-Salam model, so that $SU(2)_L\otimes SU(2)_R\otimes SU(4)_c$ 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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N. Okada, A. Stern. 2026-01-21. Symmetry Nonrestoration in the Pati-Salam Model. https://arxiv.org/abs/2601.14580

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