  The seesaw model of neutrinos might explain the size, age, flatness and
near-homogeneity of the Universe via sneutrino inflation, as well as explaining
the origin of matter via leptogenesis. The sneutrino inflation hypothesis makes
specific, testable predictions for cosmic microwave background observables,
which are compatible with the first release of data from WMAP, and for
flavour-violating charged-lepton decays. In particular, mu -> e gamma should
occur with a branching ratio very close to the present experimental upper
limit, whilst tau -> mu gamma and e gamma should occur further below the
present limits.
