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arXiv · 0906.0767

Non-Gaussianity beyond slow roll in multi-field inflation

Christian T. Byrnes·Gianmassimo Tasinato
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Abstract

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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Christian T. Byrnes, Gianmassimo Tasinato. 2009-06-04. Non-Gaussianity beyond slow roll in multi-field inflation. https://doi.org/10.1088/1475-7516/2009/08/016

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