Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2009/08/016
Keywords
inflation; non-gaussianity; cosmological perturbation theory
Funding
- Deutsche Forschungsgemeinschaft
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We study the non-Gaussianity generated during multiple-field inflation. We provide an exact expression for the bispectrum parameter f(NL) which is valid beyond the slow-roll regime, valid for certain classes of inflationary models. We then study a new, exact multi-field inflationary model considering a case where the bispectrum grows to observable values at the end of inflation. We show that in this case the trispectrum is also large and may even provide the dominant signal of non-Gaussianity.
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