The authors propose a 5D SU(5) x U(1)_PQ orbifold model in which SU(5) breaking and a high-quality QCD axion from the fifth component of the U(1) field arise from the same boundary conditions, with intermediate-scale fermions enabling gauge coupling unification.
Chiral Estimate of the Electric Dipole Moment of the Neutron in Quantum Chromodynamics,
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Five dimensional $SU(5) \times U(1)_{\rm PQ}$ grand unification
The authors propose a 5D SU(5) x U(1)_PQ orbifold model in which SU(5) breaking and a high-quality QCD axion from the fifth component of the U(1) field arise from the same boundary conditions, with intermediate-scale fermions enabling gauge coupling unification.