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Singling out SO(10) GUT models using recent PTA results

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arxiv 2307.04595 v2 pith:JVWHQH5V submitted 2023-07-10 hep-ph

Stefan Antusch , Kevin Hinze , Shaikh Saad , Jonathan Steiner This is my paper
classification hep-ph
keywords cosmicrecentadjointbackgroundinflationleadresultsstrings
verification ladder T0 review T1 audit T2 compute T3 formal
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In this work, we construct promising model building routes towards SO(10) GUT inflation and examine their ability to explain the recent PTA results hinting at a stochastic gravitational wave (GW) background at nanohertz frequencies. We consider a supersymmetric framework within which the so-called doublet-triplet splitting problem is solved without introducing fine-tuning. Additionally, realistic fermion masses and mixings, gauge coupling unification, and cosmic inflation are incorporated by utilizing superfields with representations no higher than the adjoint representation. Among the three possible scenarios, two of these cases require a single adjoint Higgs field, and do not lead to cosmic strings. In contrast, the third scenario featuring two adjoints, can lead to a network of metastable cosmic strings that generates a GW background contribution compatible with the recent PTA findings and testable by various ongoing and upcoming GW observatories.

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Cited by 5 Pith papers

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