Flaxion: a minimal extension to solve puzzles in the standard model

By Yohei Ema, K. Hamaguchi, T. Moroi, K. Nakayama. Journal of High Energy Physics, 2016

210 citations recorded by the source corpus.

We propose a minimal extension of the standard model which includes only one additional complex scalar field, flavon, with flavor-dependent global U(1) symmetry. It not only explains the hierarchical flavor structure in the quark and lepton sector (including neutrino sector), but also solves the strong CP problem by identifying the CP-odd component of the flavon as the QCD axion, which we call flaxion. Furthermore, the flaxion model solves the cosmological puzzles in the standard model, i.e., origin of dark matter, baryon asymmetry of the universe, and inflation. We show that the radial component of the flavon can play the role of inflaton without isocurvature nor domain wall problems. The dark matter abundance can be explained by the flaxion coherent oscillation, while the baryon asymmetry of the universe is generated through leptogenesis.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b05e63426eaf693bf8a9157aa7dbd8db6e1f620a

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Citations in the corpus

The landscape of QCD axion models (2020, background): “[546, 547]), in relation to possible solutions to the strong CP problem.”
Stellar recipes for axion hunters (2017, background): “It would be interesting to investigate whether other classes of models, such as the well-motivated axion/flavon models [92, 93], could also produce good fits.”
New experimental approaches in the search for axion-like particles (2018, background): “A minimal flavour-violating axion model is perhaps the axi-flavon or flaxion [11, 12].”