Higgs-lepton inflation in the supersymmetric minimal seesaw model
  We investigate a scenario of cosmological inflation realised along a flat
direction of the minimal seesaw model embedded in supergravity with a
noncanonical R-parity violating K\"{a}hler potential. It is shown that with
appropriate seesaw parameters the model is consistent with the present
observation of the cosmological microwave background (CMB) as well as with the
neutrino oscillation data. It is also shown that the baryon asymmetry of the
Universe can be generated through leptogenesis. The model favours supersymmetry
breaking with the gravitino as the lightest superparticle, and thus indicates
the gravitino dark matter scenario. An interesting feature of this model is
that the seesaw parameters are constrained by the CMB spectra. The 2-$\sigma$
constraints from the 9-year WMAP data yield a mild lower bound on the seesaw
mass scale $\gtrsim$ TeV. We expect that the observation by the Planck
satellite will soon provide more stringent constraints. The phenomenological
and cosmological implications of the R-parity violation are also discussed.
