A Left-Right Symmetric Model for Neutrino Masses, Baryon Asymmetry and Dark Matter

摘要

In the left-right symmetric models without bi-doublet Higgs scalars, thestandard model fermions can obtain masses by integrating out heavy chargedsinglet fermions. We find the decays of heavy neutral singlet fermions,responsible for generating small neutrino masses, can simultaneously produce aleft-handed lepton asymmetry for baryon asymmetry and a relic density ofright-handed neutrinos for dark matter. Benefited from the left-right symmetry,the properties of the dark matter can be related to the generation of theneutrino masses and the baryon asymmetry. We also indicate that the decays ofthe non-thermally produced right-handed neutrinos can explain the observedfluxes of 511 keV photons from the Galactic bulge.