A predictive SO(10) model
Oct 7, 2022
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Abstract: (IOP)
We discuss some testable predictions of a non-supersymmetric SO(10) model supplemented
by a Peccei-Quinn symmetry. We utilize a symmetry breaking pattern of SO(10) that yields
unification of the Standard Model gauge couplings, with the unification scale also linked to
inflation driven by an SO(10) singlet scalar field with a Coleman-Weinberg potential. Proton
decay mediated by the superheavy gauge bosons may be observable at the proposed Hyper-Kamiokande
experiment. Due to an unbroken Z
gauge symmetry from SO(10), the model predicts the presence
of a stable intermediate mass fermion which, together with the axion, provides the desired relic
abundance of dark matter. The model also predicts the presence of intermediate scale topologically
stable monopoles and strings that survive inflation. The monopoles may be present in the Universe
at an observable level. We estimate the stochastic gravitational wave background emitted by the
strings and show that it should be testable in a number of planned and proposed space and land
based experiments. Finally, we show how the observed baryon asymmetry in the Universe is realized
via non-thermal leptogenesis.Note:
- 36 pages, 9 figures, version published in JCAP
- Cosmic strings
- domain walls
- monopoles
- dark matter theory
- inflation
- leptogenesis
- symmetry: gauge
- monopole: stability
- dark matter: relic density
- baryon: asymmetry
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Figures(19)
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