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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 $\sigma$ 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 $\sigma$ (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 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 $\alpha$ ≃ −7 × 10$^{−4}$, the axion mass $m_A$ ∼ 100 $\mu$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.
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Contributor : Bruno Savelli Connect in order to contact the contributor
Submitted on : Wednesday, October 12, 2022 - 3:38:23 PM
Last modification on : Friday, October 14, 2022 - 3:31:24 AM


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Guillermo Ballesteros, Javier Redondo, Andreas Ringwald, Carlos Tamarit. Unifying inflation with the axion, dark matter, baryogenesis and the seesaw mechanism. Physical Review Letters, 2017, 118, pp.071802. ⟨10.1103/PhysRevLett.118.071802⟩. ⟨cea-01357144v2⟩



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