Unifying Inflation with the Axion, Dark Matter, Baryogenesis, and the Seesaw Mechanism
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 righthanded SMsinglet neutrinos, a new vectorlike color triplet fermion, and a complex SMsinglet scalar σ that stabilizes the Higgs potential and whose vacuum expectation value at ̃1 0^{11} GeV breaks lepton number and a PecceiQuinn symmetry simultaneously. Primordial inflation is produced by a combination of σ (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 seesawgenerated neutrino masses, plus the axion, which solves the strong C P problem and accounts for the dark matter in the Universe. The model predicts a minimum value of the tensortoscalar ratio r ≃0.004 , running of the scalar spectral index α ≃7 × 10^{4}, the axion mass m_{A}̃100 μ eV , and cosmic axion background radiation corresponding to an increase of the effective number of relativistic neutrinos of ̃0.03 . It can be probed decisively by the next generation of cosmic microwave background and axion dark matter experiments.
 Publication:

Physical Review Letters
 Pub Date:
 February 2017
 DOI:
 10.1103/PhysRevLett.118.071802
 arXiv:
 arXiv:1608.05414
 Bibcode:
 2017PhRvL.118g1802B
 Keywords:

 High Energy Physics  Phenomenology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 High Energy Physics  Theory
 EPrint:
 7 pages, 2 figures