Large trispectrum in two-field slow-roll inflation
- School of Physics and Astronomy, Queen Mary University of London, Mile End Road, London (United Kingdom)
- Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)
We calculate the conditions required to produce a large local trispectrum during two-field slow-roll inflation. This is done by extending and simplifying the 'heat-map' approach developed by Byrnes et al. The conditions required to generate a large trispectrum are broadly the same as those that can produce a large bispectrum. We derive a simple relation between τ{sub NL} and f{sub NL} for models with separable potentials, and furthermore show that g{sub NL} and τ{sub NL} can be related in specific circumstances. Additionally, we interpret the heatmaps dynamically, showing how they can be used as qualitative tools to understand the evolution of non-Gaussianity during inflation. We also show how f{sub NL}, τ{sub NL} and g{sub NL} are sourced by generic shapes in the inflationary potential, namely ridges, valleys and inflection points.
- OSTI ID:
- 22279929
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 09 Vol. 2012; ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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