Primordial trispectrum from inflation

Details Primordial trispectrum from inflation Primordial trispectrum from inflation

2006-11-02

arxiv.org/abs/astro-ph/0611075v2

Phys.Rev.D74:123519,2006

Astronomy and Astrophysics

Astrophysics

9 pages, no figures, v2: references added, minor changes, matches version to be published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.74.123519

We use the delta N-formalism to describe the leading order contributions to the primordial power spectrum, bispectrum and trispectrum in multiple-field models of inflation at leading order in a perturbative expansion. In slow-roll models where the initial field fluctuations at Hubble-exit are nearly Gaussian, any detectable non-Gaussianity is expected to come from super-Hubble evolution. We show that the contribution to the primordial trispectrum can be described by two non-linearity parameters, tau_{NL} and g_{NL}, which are dependent upon the second and third derivatives of the local expansion with respect to the field values during inflation.

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