[SEMINARI]: Prof. Smirnov: Baryogenesis via Neutrino Oscillations

[Arcadi Santamaria]

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                              S E M I N A R I

            [Image]    Departament de Física Teòrica     [Image]
                          Universitat de València
                      46100 Burjassot (València) Spain

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                      Baryogenesis via Neutrino Oscillations

                              Prof. A. Smirnov

                               (ICTP-Trieste)

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                     Aula de Seminaris de Física Teòrica
                   Thursday 23 of April of 1998 at 12:00
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                                    Resum

   We propose a new mechanism of leptogenesis in which the asymmetries in
    lepton numbers are produced through the CP-violating oscillations of
 ``sterile'' (electroweak singlet) neutrinos. The asymmetry is communicated
 from singlet neutrinos to ordinary leptons through their Yukawa couplings.
      The lepton asymmetry is then reprocessed into baryon asymmetry by
 electroweak sphalerons. We show that the observed value of baryon asymmetry
 can be generated in this way, and the masses of ordinary neutrinos induced
    by the seesaw mechanism are in the astrophysically and cosmologically
   interesting range. Except for singlet neutrinos, no physics beyond the
                        Standard Model is required.

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