Leptogenesis in the superstring inspired E 6 model
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Date
2007-04-23T14:14:11Z
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Abstract
The observed baryon asymmetry of the Universe is elegantly explained in
the framework of the baryogenesis via leptogenesis scenario. We analyze
various aspects of this scenario including the influence of perturbations of
the energy density and space–time metric perturbations on the generation
of the lepton and baryon asymmetries. We also consider conversion of
the lepton asymmetry into the baryon asymmetry and investigate the effects
associated with the fact, that the lepton asymmetry induces nonzero
chemical potentials of the other species. We estimate upper bound on
the asymmetry in the Standard Model and in the superstring inspired E6
model. Properties of this model relevant for leptogenesis are discussed in
detail. The baryogenesis via leptogenesis scenario predicts nonzero masses
of the neutrinos, measured in the oscillation experiments. We calculate
cross sections of the charged and neutral current coherent pion production
by neutrino scattering off nuclei relevant for the interpretation of the
experimental results.
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Keywords
Leptogenesis, E 6, Supersymmetry, Sphaleron, Inhomogeneous universe