1–8 mars 2008
La Thuile
Fuseau horaire Europe/Paris

Dirac phase leptogenesis

5 mars 2008, 17:05
5m
Van Gogh (7th floor) (La Thuile)

Van Gogh (7th floor)

La Thuile

Rencontres de Moriond Planibel Hotel - La Thuile Aosta Valley 11016 La Thuile (Aosta), Italy Phone : 39 (0)1 65 88 45 41 Fax : 39 (0)1 65 88 45 35

Orateur

M. Steve Blanchet (Max-Planck-Institut fuer Physik, Munich)

Description

As it was recently realized, flavor effects in leptogenesis modify the established "unflavored" picture in many ways. One of them is the appearance of a link between low-energy CP violating phases and the matter-antimatter asymmetry of the Universe. In particular, the only phase in the PMNS mixing matrix that one can hope to measure in the future, i.e. the Dirac phase, can be the unique source of CP violation necessary to explain the observed matter-antimatter asymmetry of the Universe. In the hierarchical limit for the heavy neutrinos, the Dirac phase can play this role, although the allowed parameter space is quite small and mainly in the weak wash-out, i.e. with dependence on the initial conditions. A way to overcome these difficulties is to go to degenerate heavy neutrinos. There, nice constraints involving low-energy parameters like \theta_13 and m_1 could be found from successful leptogenesis.

Auteur principal

M. Steve Blanchet (Max-Planck-Institut fuer Physik, Munich)

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