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Chiral models of composite axions and accidental Peccei-Quinn symmetry
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We introduce a class of composite axion models that provide a natural solution to the strong CP problem, and possibly account for the observed dark matter abundance. The QCD axion arises as a composite Nambu-Goldstone boson (NGB) from the dynamics of a chiral gauge theory with a strongly-interacting and confining SU(N) factor and a weakly-interacting U(1), with no fundamental scalar fields. The Peccei-Quinn (PQ) symmetry is accidental and all the mass scales are generated dynamically. We analyze specific models where the PQ symmetry is broken only by operators of dimension 12 or higher. We also classify several other models where the PQ symmetry can be potentially protected up to the dimension 15 or 18 level. Our framework can be easily extended to a scenario where the Standard Model (SM) is unified into a simple gauge group, and we discuss the case of non-supersymmetric SU(5) unification. The GUT models predict the existence of additional pseudo NGBs, parametrically lighter than the GUT and PQ scales, which could have an impact on the cosmological evolution and leave observable signatures. We also clarify the selection rules under which higher-dimensional PQ-violating operators can generate a potential for the axion in the IR, and provide a discussion of the discrete symmetries in composite axion models associated to the number of domain walls. These results can be of general interest for composite axion models based on a QCD-like confining gauge group.
Forward citations
Cited by 11 Pith papers
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A 4D moose gauge theory with gauged WZW term deconstructs the 5D orbifold axion, reproducing its shift symmetry, instanton effects, and quality features via collective PNGB dynamics.
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A 5D holographic QCD axion model identifies bulk modes for the axion and eta prime, traces the quality problem to insufficient compositeness, and finds the physical axion mostly in the bulk gauge field when quality is high.
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A High-Quality Axion from Exact SUSY Chiral Dynamics
A supersymmetric chiral gauge theory stabilized by anomaly-mediated supersymmetry breaking produces a composite QCD axion whose Peccei-Quinn symmetry is protected by a discrete gauge symmetry.
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Specially Embedding a Composite Axion Model
Special embedding of the composite axion and QCD gauge groups into a larger product gauge group reduces the domain wall number to unity and induces a controlled bias term from UV instantons that destabilizes the walls.
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Accidental Peccei-Quinn Symmetry from Chiral Gauge Symmetry and Mirror QCD
A chiral U(1) gauge symmetry generates an accidental Peccei-Quinn symmetry broken by mirror QCD, solving the strong CP problem without a light axion while supplying WIMP dark matter, stochastic gravitational waves, an...
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Axion Quality in Warped Extra-Dimension
Warped extra-dimensional axion models achieve high quality when nonlocal U(1)-charged field effects are sufficiently suppressed by the warp factor and orbifold structure.
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Axion Quality Problem: Keep Calm and Baryon
The QCD axion can be the Goldstone boson of baryon number in a minimal N_c=N_f supersymmetric QCD sector, with PQ-breaking effects suppressed by dimension N_c+2 operators.
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