Non-Gaussianity from the inflationary trispectrum

Seery, David and Lidsey, James E (2007) Non-Gaussianity from the inflationary trispectrum. Journal of Cosmology and Astroparticle Physics, 2007 (1). ISSN 1475-7516

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We present an estimate for the non-linear parameter tau(NL), which measures the non-Gaussianity imprinted in the trispectrum of the comoving curvature perturbation, zeta. Our estimate is valid throughout the inflationary era, until the slow-roll approximation breaks down, and takes into account the evolution of perturbations on superhorizon scales. We find that the non-Gaussianity is always small if the field values at the end of inflation are negligible when compared to their values at horizon crossing. Under the same assumption, we show that in N-flation-type scenarios, where the potential is a sum of monomials, the non-Gaussianity measured by tau(NL) is independent of the couplings and initial conditions.

Item Type: Article
Additional Information: Article Number: 008
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: David Seery
Date Deposited: 06 Feb 2012 20:15
Last Modified: 30 Mar 2012 10:46
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