Axion quality from the (anti)symmetric of SU(N)

Ardu, Marco; Landini, Giacomo; Teresi, Daniele; Wang, Jin-Wei; Strumia, Alessandro; Di Luzio, Luca

Preprint

PUBDB-2020-02985

Axion quality from the (anti)symmetric of SU(N)

Ardu, M. ; Di Luzio, L.DESY* ; Landini, G. ; Strumia, A. (Corresponding author) ; Teresi, D. ; Wang, J.-W.

2020

1-24 (2020) [10.3204/PUBDB-2020-02985]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2020-02985

Report No.: DESY-20-124; arXiv:2007.12663

Abstract: We propose two models where a U(1) Peccei-Quinn global symmetry arises accidentally and is respected up to high-dimensional operators, so that the axion solution to the strong CP problem is successful even in the presence of Planck-suppressed operators. One model is SU$(N)$ gauge interactions with fermions in the fundamental and a scalar in the symmetric. The axion arises from spontaneous symmetry breaking to SO$(N)$, that confines at a lower energy scale. Axion quality in the model needs $N \gtrsim 10$. SO bound states and possibly monopoles provide extra Dark Matter candidates beyond the axion. In the second model the scalar is in the anti-symmetric: SU$(N)$ broken to Sp$(N)$ needs even $N \gtrsim 20$. The cosmological DM abundance, consisting of axions and/or super-heavy relics, can be reproduced if the PQ symmetry is broken before inflation (Boltzmann-suppressed production of super-heavy relics) or after (super-heavy relics in thermal equilibrium get partially diluted by dark glue-ball decays).

Keyword(s): model: scalar ; symmetry: Peccei-Quinn ; interaction: gauge ; symmetry: global ; strong interaction: CP ; axion ; dark matter ; quality ; spontaneous symmetry breaking ; bound state ; inflation ; monopole ; thermal ; SU(N) ; U(1)