| Abstract: |
In this talk I will review recent attempts to build heavy axion models that enlarge the parameter space for axions which solve the strong CP problem well beyond that of invisible axion models. Then I will concentrate in our recent work "Color Unified Dynamical Axion" where an enlarged color sector is introduced and the strong CP problem is solved via new massless fermions. QCD color is unified with another non-Abelian group with a large confinement scale. The spontaneous breaking of the unified color group provides a source of naturally large axion mass due to small size instantons, and as a result no very light axions are present in the low-energy spectrum. The axion scale may be not far from the TeV region which translates to observable signals at colliders. Based on: https://arxiv.org/abs/1805.06465 in collaboration with M.K. Gaillard, M.B. Gavela, R. Houtz and R. del Rey.
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