File(s) not publicly available
Non-Gaussianity from the inflationary trispectrum
We present an estimate for the non-linear parameter tau(NL), which measures the non-Gaussianity imprinted in the trispectrum of the comoving curvature perturbation, zeta. Our estimate is valid throughout the inflationary era, until the slow-roll approximation breaks down, and takes into account the evolution of perturbations on superhorizon scales. We find that the non-Gaussianity is always small if the field values at the end of inflation are negligible when compared to their values at horizon crossing. Under the same assumption, we show that in N-flation-type scenarios, where the potential is a sum of monomials, the non-Gaussianity measured by tau(NL) is independent of the couplings and initial conditions.
History
Publication status
- Published
Journal
Journal of Cosmology and Astroparticle PhysicsISSN
1475-7516External DOI
Issue
1Volume
2007Department affiliated with
- Physics and Astronomy Publications
Notes
Article Number: 008Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06Usage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC