You have full access to this open access article. 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 β the SU 2 five-plet and SU 3 ten-plet β 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. Download to read the full article text. Weinberg, Approximate symmetries and pseudoGoldstone bosons , Phys. Bars and K. Lane, Gauge model for the pion mass and the rho-prime vector boson , Phys. Georgi and A. Pais, Vacuum symmetry and the pseudoGoldstone phenomenon , Phys.
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