Accidentally light scalars from large representations

oleh: F. Brümmer, G. Ferrante, M. Frigerio, T. Hambye

Format: Article
Diterbitkan: SpringerOpen 2024-01-01

Deskripsi

Abstract In models with spontaneous symmetry breaking by scalar fields in large group representations, we observe that some of the scalar masses can be loop-suppressed with respect to the naive expectation from symmetry selection rules. We present minimal models — the SU(2) five-plet and SU(3) ten-plet — with such accidentally light scalars, featuring compact tree-level flat directions lifted by radiative corrections. We sketch some potential applications, from stable relics and slow roll in cosmology, to hierarchy and fine-tuning problems in particle physics.