Light inflaton after LHC8 and WMAP9 results
  We update the allowed parameter space of the simple chaotic inflationary
model with quartic potential and light inflaton [Bezrukov,Gorbunov'2009] taking
into account recent results from cosmology (CMB observations from SPT, ACT and
WMAP) and from particle physics (LHC hints of the SM Higgs boson). The
non-minimal (yet small) coupling to gravity of the inflaton becomes essential
to fit the observational data. The inflaton has mass above 300 MeV and can be
searched for at B-factories in B-meson two-body decays to kaon and inflaton.
The inflaton lifetime depends on the model parameters, resulting in various
inflaton signatures: either a missing energy, or a displaced vertex from the
B-meson decay position, or a resonance in the Dalitz plot of a three particle
decay. We also discuss the implementation of the inflaton model to the nuMSM,
where the inflaton can be responsible for production of the dark matter sterile
neutrino in the early Universe.
