Kavli Affiliate: Hitoshi Murayama
| First 5 Authors: Tony Gherghetta, Hitoshi Murayama, Pablo Quílez, ,
| Summary:
We present a composite QCD axion model where the Peccei–Quinn (PQ) symmetry
emerges as a high-quality, accidental symmetry. The axion potential is only
modified by eight-fermion, dimension 12 operators, which if present at the
Planck scale, allow for axion dark matter from misalignment while solving the
strong CP problem. The model is an $text{SU}(N_c)$ gauge theory with ten
flavors where the Pati–Salam unified subgroup $text{SO}(6)times text{SO}(4)
subset text{SU}(10)_L$ and $text{Sp}(10)subset text{SU}(10)_R$ are weakly
gauged. The dynamics breaks $text{SU}(10)_Ltimes text{SU}(10)_R rightarrow
text{SU}(10)_V$ and the weakly-gauged groups to $text{U}(3)times text{U}(2)
supset text{SU}(3)_c times text{SU}(2)_L times text{U}(1)_Y$, with the
QCD axion identified as one of the Nambu-Goldstone bosons. This axion has a
relatively large coupling to photons while a residual $bar{theta}_{rm eff}$
may be just below the current limit on the neutron electric dipole moment. If
the dimension 12 operators are present near the GUT scale, they can cause
domain wall networks to decay, allowing for axion dark matter even for the
post-inflationary scenario.
| Search Query: ArXiv Query: search_query=au:”Hitoshi Murayama”&id_list=&start=0&max_results=3