Axion Inflation, Proton Decay and Leptogenesis in $SU(5)\times U(1{)}_{PQ}$

Abstract

We implement inflation in a non-supersymmetric SU(5) model based on a non-minimal coupling of the axion field to gravity. The isocurvature fluctuations are adequately suppressed, axions comprise the dark matter, proton lifetime estimates are of order 8e34-3e35 years, and the observed baryon asymmetry arises via non-thermal leptogenesis. The presence of low scale colored scalars ensures unification of the Standard Model gauge couplings and also helps in stabilizing the electroweak vacuum.

8 pages, 4 figures. v2: matches published version in PRD

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• Proton decay
• Spontaneous proton decay and the origin of Peccei-Quinn symmetry
• Revisiting isocurvature bounds in models unifying the axion with the inflaton
• Minimal solution to the axion isocurvature problem from a nonminimal coupling
• $W$ Boson Mass and Grand Unification via the Type-$\mathrm{I}\mathrm{I}$ Seesaw-like Mechanism
• A detailed exploration of the EDGES 21 cm absorption anomaly and axion-induced cooling
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• $SU(5)\times U(1{)}_X$ Axion Model with Observable Proton Decay
• Five dimensional $SU(5)\times U(1{)}_{\mathrm{PQ}}$ grand unification