The inflationary trispectrum

Details The inflationary trispectrum The inflationary trispectrum

2006-10-06

arxiv.org/abs/astro-ph/0610210v2

JCAP 0701:027,2007

Astronomy and Astrophysics

Astrophysics

23 pages, 2 diagrams drawn with feynmp.sty, uses iopart.cls. v2, replaced with version accepted by JCAP. Estimate of maximal t

Scientific paper

10.1088/1475-7516/2007/01/027

We calculate the trispectrum of the primordial curvature perturbation generated by an epoch of slow-roll inflation in the early universe, and demonstrate that the non-gaussian signature imprinted at horizon crossing is unobservably small, of order tau_NL < r/50, where r < 1 is the tensor-to-scalar ratio. Therefore any primordial non-gaussianity observed in future microwave background experiments is likely to have been synthesized by gravitational effects on superhorizon scales. We discuss the application of Maldacena's consistency condition to the trispectrum.

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