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On the vacuum of the minimal nonsupersymmetric SO(10) unification

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arxiv 0912.1796 v2 pith:CI2UGTOL submitted 2009-12-09 hep-ph

Stefano Bertolini , Luca Di Luzio , Michal Malinsky This is my paper
classification hep-ph
keywords breakingnonsupersymmetricpotentialunificationgrandhiggsintermediatelevel
verification ladder T0 review T1 audit T2 compute T3 formal
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We study a class of nonsupersymmetric SO(10) grand unified scenarios where the first stage of the symmetry breaking is driven by the vacuum expectation values of the 45-dimensional adjoint representation. Three decade old results claim that such a Higgs setting may lead exclusively to the flipped SU(5) x U(1) intermediate stage. We show that this conclusion is actually an artifact of the tree level potential. The study of the accidental global symmetries emerging in various limits of the scalar potential offers a simple understanding of the tree level result and a rationale for the drastic impact of quantum corrections. We scrutinize in detail the simplest and paradigmatic case of the 45_{H} + 16_{H} Higgs sector triggering the breaking of SO(10) to the standard electroweak model. We show that the minimization of the one-loop effective potential allows for intermediate SU(4)_C x SU(2)_L x U(1)_R and SU(3)_c x SU(2)_L x SU(2)_R x U(1)_{B-L} symmetric stages as well. These are the options favoured by gauge unification. Our results, that apply whenever the SO(10) breaking is triggered by <45_H>, open the path for hunting the simplest realistic scenario of nonsupersymmetric SO(10) grand unification.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Unravelling the Scalar Sector of Grand Unification: Phenomenology & Implications

    hep-ph 2025-07 accept novelty 6.0 of 10

    A systematic classification of how grand unified theory scalars violate baryon and lepton number, predicting a kaon-dominant proton decay pattern and mass bounds down to scales far below the GUT scale.

  2. Thermal leptogenesis in minimal unified models

    hep-ph 2025-06 conditional novelty 4.0 of 10

    Thermal leptogenesis in minimal flipped SU(5) and SO(10) models tightly constrains their flavour parameters, yielding a lightest-neutrino mass below 0.03 eV and a B-L breaking scale near 10^12.5 GeV.

  3. Baryogenesis through leptogenesis in the minimal flipped $SU(5)$ with radiative seesaw

    hep-ph 2025-06 conditional novelty 2.0 of 10

    In the minimal flipped SU(5) model with radiative seesaw, successful thermal leptogenesis implies an upper limit on the lightest neutrino mass of about 3 x 10^-2 eV, testable at KATRIN.

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