Yuki Watanabe (ASC, LMU Munich)

Title: δN versus covariant perturbative approach to non-Gaussianity
outside the horizon in multifield inflation

We compute the super-Hubble evolution of non-Gaussianity of primordial
curvature perturbations in two-field inflation models by employing two
formalisms: δN and covariant formalisms. Although two formalisms treat
the evolution of fluctuations radically different, we show that the
formulas of f_{NL} parameter agree quantitatively with each other
within 1 % accuracy. We also find that the amplitude of f_{NL} decays
no faster than a^{-3} as the inflationary trajectory reaches to the
adiabatic limit.

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