Non-Gaussianity beyond slow roll in multi-field inflation

Details Non-Gaussianity beyond slow roll in multi-field inflation Non-Gaussianity beyond slow roll in multi-field inflation

2009-06-04

arxiv.org/abs/0906.0767v3

JCAP 0908:016,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

18 pages, 1 figure. v2: References and plots added, typos fixed. To be published in JCAP. v3: Sign error in Sec 4.2 corrected,

Scientific paper

10.1088/1475-7516/2009/08/016

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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