Abstract
In theories with no fundamental scalars, one gauge group can become strong at a large scale Λ and spontaneously break a global symmetry, producing the Higgs and the axion as composite pseudo-Nambu-Goldstone bosons. We show how KSVZ and DFSZ axion models can be naturally realised. The assumption Λ ≈ 1011 GeV is phenomenologically favoured because: a) The axion solves the QCD θ problem and provides the observed DM abundance; b) The observed Higgs mass is generated via RGE effects from a small Higgs quartic coupling at the compositeness scale, provided that the Higgs mass term is fine-tuned to be of electroweak size; c) Lepton, quark as well as neutrino masses can be obtained from four-fermion operators at the compositeness scale. d) Extra fermions can unify the gauge couplings.
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ArXiv ePrint: 1208.6013
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Redi, M., Strumia, A. Axion-Higgs unification. J. High Energ. Phys. 2012, 103 (2012). https://doi.org/10.1007/JHEP11(2012)103
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DOI: https://doi.org/10.1007/JHEP11(2012)103