Simple route to non-Gaussianity in inflation

Details Simple route to non-Gaussianity in inflation Simple route to non-Gaussianity in inflation

2004-10-20

arxiv.org/abs/astro-ph/0410486v3

Phys.Rev. D72 (2005) 083507

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures. v2: Updated formalism to version described in astro-ph/0504508, leading to dropping of one unnecessary app

Scientific paper

10.1103/PhysRevD.72.083507

We present a simple way to calculate non-Gaussianity in inflation using fully non-linear equations on long wavelengths with stochastic sources to take into account the short-wavelength quantum fluctuations. Our formalism includes both scalar metric and matter perturbations, combining them into variables which are invariant under changes of time slicing in the long-wavelength limit. We illustrate this method with a perturbative calculation in the single-field slow-roll case. We also introduce a convenient choice of variables to graphically present the full momentum dependence of the three-point correlator.

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