The free and safe fate of symmetry non-restoration

Abstract

We investigate the high temperature fate of four dimensional gauge-Yukawa theories featuring short distance conformality of either interacting or non-interacting nature. The latter is known as complete asymptotic freedom and, as templates, we consider non-abelian gauge theories featuring either two singlet scalars coupled to gauged fermions via Yukawa interactions or two gauged scalars with(out) fermions. For theories with interacting fixed points at short distance, known as asymptotically safe, we consider two calculable examples. Exploring the landscape of safe and free theories above we discover a class of complete asymptotically free theories for which symmetry breaks at arbitrary high temperatures. In its minimal form this class is constituted by a theory with two fundamental gauged scalars each gauged under an independent group.

35 pages, section 2.2.5 and appendix C.5 added with new example of symmetry non-restoration: two SU(Nc) groups, each with a scalar adjoint

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• Finite size effects in the phase transition patterns of coupled scalar field systems
• Symmetry breaking patterns for two coupled complex scalar fields at finite temperature and in an external magnetic field
• Conformal Windows beyond Asymptotic Freedom