Abstract
We present a minimal non-supersymmetric SO(10) GUT breaking directly to the Standard Model gauge group. Precise gauge coupling unification is achieved due to the presence of two color-octet scalars, one of which is accessible to LHC searches. Proton lifetime is predicted to be below 4.5×1034 years, which is within the projected five-year sensitivity of the proposed Hyper-Kamiokande experiment. We find that the Standard Model observables are reproduced to a reasonable accuracy in a numerical fit, which also predicts the unknown neutrino parameters. Finally, the two scalar representations stabilize the electroweak vacuum and the dark matter is comprised of axions.
Highlights
Non-supersymmetric SO(10) grand unified theories (GUTs) [1, 2] provide an appealing framework for physics beyond the Standard Model (SM)
Non-supersymmetric GUTs based on SO(10) gauge symmetry provide a promising framework for new physics
Gauge coupling unification is achieved by splitting a representation contributing to the breaking of SO(10), namely the 210H, such that two coloroctet scalar representations have intermediate masses
Summary
Non-supersymmetric SO(10) grand unified theories (GUTs) [1, 2] provide an appealing framework for physics beyond the Standard Model (SM). We will present an SO(10) GUT, which addresses the unification of the SM and the problem of dark matter in a minimal way. We will not invoke an intermediate breaking step between the electroweak scale and the GUT scale We will consider a global Peccei–Quinn (PQ) symmetry [16] to solve the strong CP problem and provide a dark matter candidate [16,17,18,19].
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