2016/01/31 by Kazunori Nakayama, Fuminobu Takahashi, Tsutomu T. Yanagida · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Electron #Gravitino #Higgs boson #Higgs field #Inflation (cosmology) #Inflaton #Leptogenesis #Lepton #Neutrino #Neutrino oscillation #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Seesaw mechanism #Supergravity #Supersymmetry #Theoretical physics #astro-ph.CO #hep-ph
paper · pdf · doi:10.1016/j.physletb.2016.03.051
18 pages, 2 figures; (v2) title changed, to appear in Phys.Lett.B
arxiv created 2016/03/18 · openalex publication_date 2016/03/22 · arxiv updated 2016/03/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We show that the seesaw mechanism as well as leptogenesis are natural outcomes of a viable chaotic inflation in supergravity . The inflation model contains two superfields, the inflaton and stabilizer fields, which, being singlets under the standard model gauge symmetry, naturally couple to the lepton and Higgs doublets. The inflaton decays into leptons and Higgs fields, and the reheating temperature is predicted to be of O ( 10 13 ) GeV , for which thermal leptogenesis is possible. On the other hand, gravitinos are copiously produced, and various solutions to the gravitino problem are discussed. We also argue that, if the shift symmetry of the inflaton is explicitly broken down to a discrete one, neutrino Yukawa couplings are periodic in the inflaton field, and masses of leptons and Higgs do not blow up even if the inflaton takes super-Planckian field values. The inflaton potential is given by a sum of sinusoidal functions with different height and periodicity, the so-called multi-natural inflation. We show that the predicted scalar spectral index and tensor-to-scalar ratio lie in the region favored by the Planck data.