Abstract
A minimal extension of the standard model (SM) with a single new mass scale and providing a complete and consistent picture of particle physics and cosmology up to the Planck scale is presented. We add to the SM three right-handed SM-singlet neutrinos, a new vectorlike color triplet fermion, and a complex SM-singlet scalar that stabilizes the Higgs potential and whose vacuum expectation value at breaks lepton number and a Peccei-Quinn symmetry simultaneously. Primordial inflation is produced by a combination of (nonminimally coupled to the scalar curvature) and the SM Higgs boson. Baryogenesis proceeds via thermal leptogenesis. At low energies, the model reduces to the SM, augmented by seesaw-generated neutrino masses, plus the axion, which solves the strong problem and accounts for the dark matter in the Universe. The model predicts a minimum value of the tensor-to-scalar ratio , running of the scalar spectral index , the axion mass , and cosmic axion background radiation corresponding to an increase of the effective number of relativistic neutrinos of . It can be probed decisively by the next generation of cosmic microwave background and axion dark matter experiments.
- Received 22 August 2016
DOI:https://doi.org/10.1103/PhysRevLett.118.071802
© 2017 American Physical Society
Physics Subject Headings (PhySH)
Synopsis
Model Tries to Solve Five Physics Problems at Once
Published 15 February 2017
A minimal extension to the standard model of particle physics involves six new particles.
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