Non-Gaussianity from two right-handed sneutrino curvaton decays
  In this paper, we consider the effect of two right-handed sneutrino curvaton
decays and investigate the parameter space. We compare the difference of the
result between single- and two-curvaton cases. We find one Yukawa coupling of
the right-handed snetrinos can be as large as $\lambda \sim 0.1$ while the
other one is much smaller which is consistent with the idea that only one
generation of the neutrino mass may be much smaller than others. When the
curvatons decay, we assume both of them subdominate the energy density of the
universe. We find that, unlike a single curvaton case, here a small or
negative, as well as a large $f_{NL}$ can be generated.
