Non-Gaussianity beyond slow roll in multi-field inflation
Journal Article
·
· Journal of Cosmology and Astroparticle Physics
- Institut für Theoretische Physik, Philosophenweg 16 and 19, 69120 Heidelberg (Germany)
We study the non-Gaussianity generated during multiple-field inflation. We provide an exact expression for the bispectrum parameter f{sub 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.
- OSTI ID:
- 22273224
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 08 Vol. 2009; ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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