title: 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 right-handed SM-singlet neutrinos, a new vectorlike color triplet fermion, and a complex SM-singlet scalar σ that stabilizes the Higgs potential and whose vacuum expectation value at ∼10^{11}  GeV breaks lepton number and a Peccei-Quinn 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 seesaw-generated neutrino masses, plus the axion, which solves the strong CP problem and accounts for the dark matter in the Universe. The model predicts a minimum value of the tensor-to-scalar ratio r≃0.004, running of the scalar spectral index α≃-7×10^{-4}, the axion mass m_{A}∼100  μeV, 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.
authors.affiliation: Institut de Physique Théorique, Université Paris Saclay, CEA, CNRS, 91191 Gif-sur-Yvette, France.
authors.forename: Guillermo
authors.initials: G
authors.lastname: Ballesteros
authors.affiliation: Departamento de Física Teórica, Universidad de Zaragoza, Pedro Cerbuna 12, E-50009 Zaragoza, Spain.|Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München, Germany.
authors.forename: Javier
authors.initials: J
authors.lastname: Redondo
authors.affiliation: DESY, Notkestrasse 85, 22607 Hamburg, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Ringwald
authors.affiliation: Institute for Particle Physics Phenomenology, Durham University South Road, Durham DH1 3LE, United Kingdom.
authors.forename: Carlos
authors.initials: C
authors.lastname: Tamarit