Axion Model with Intermediate Scale Fermionic Dark Matter

Abstract

We investigate a non-supersymmetric $SO(10)\times U(1{)}_{\mathrm{PQ}}$ axion model in which the spontaneous breaking of $U(1{)}_{\mathrm{PQ}}$ occurs after inflation, and the axion domain wall problem is resolved by employing the Lazarides-Shafi mechanism. This requires the introduction of two fermion 10-plets, such that the surviving discrete symmetry from the explicit $U(1{)}_{\mathrm{PQ}}$ breaking by QCD instantons is reduced from $Z_{12}$ to $Z_4$, where $Z_4$ coincides with the center of $SO(10)$ (more precisely $Spin(10)$). An unbroken $Z_2$ subgroup of $Z_4$ yields intermediate scale topologically stable strings, as well as a stable electroweak doublet non-thermal dark matter candidate from the fermion 10-plets with mass comparable to or somewhat smaller than the axion decay constant $f_{\mathrm{a}}$. We present an explicit realization with inflation taken into account and which also incorporates non-thermal leptogenesis. The fermion dark matter mass lies in the $3\times 10^8-10^{10}\mathrm{GeV}$ range and its contribution to the relic dark matter abundance can be comparable to that from the axion.

9 pages, 5 figures included, version to be published in Phys. Lett. B

References in corpus (4)

• CMB power spectrum contribution from cosmic strings using field-evolution simulations of the Abelian Higgs model
• Dark Matter and Gauge Coupling Unification in Non-supersymmetric SO(10) Grand Unified Models
• Unification, Proton Decay and Topological Defects in non-SUSY GUTs with Thresholds
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Cited by in corpus (10)

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• Accidental SO(10) axion from gauged flavour
• Heavier $W$ boson, dark matter and gravitational waves from strings in an $SO(10)$ axion model
• A Predictive $SO(10)$ Model
• Topological structures, dark matter and gravitational waves in $E_6$
• Revisiting isocurvature bounds in models unifying the axion with the inflaton
• Electroweak monopoles and magnetic dumbbells in grand unified theories
• Axions, WIMPs, proton decay and observable $r$ in $SO(10)$
• Proton Decay in Supersymmetric $SU(4{)}_c\times SU(2{)}_L\times SU(2{)}_R$
• Boson dark matter halos with a dominant noncondensed component