Monday, February 27, 2012

1110.2462 (Yuki Watanabe)

δN versus covariant perturbative approach to non-Gaussianity
outside the horizon in multifield inflation
   [PDF]

Yuki Watanabe
We compute the super-Hubble evolution of non-Gaussianity of primordial
curvature perturbations in two-field inflation models by employing two
formalisms: delta N 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
analytically find that the amplitude of f_{NL} decays no faster than a^{-3} as
the inflationary trajectory reaches to the adiabatic limit for generic
potentials.
View original: http://arxiv.org/abs/1110.2462

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