Review of local non-Gaussianity from multi-field inflation

Details Review of local non-Gaussianity from multi-field inflation Review of local non-Gaussianity from multi-field inflation

2010-02-16

arxiv.org/abs/1002.3110v2

Adv.Astron.2010:724525,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

22 pages, 2 figures. Invited review for the special issue "Testing the Gaussianity and Statistical Isotropy of the Universe" f

Scientific paper

10.1155/2010/724525

We review models which generate a large non-Gaussianity of the local form. We first briefly consider three models which generate the non-Gaussianity either at or after the end of inflation; the curvaton scenario, modulated (p)reheating and an inhomogeneous end of inflation. We then focus on ways of generating the non-Gaussianity during inflation. We derive general conditions which a product or sum separable potential must satisfy in order to generate a large local bispectrum during slow-roll inflation. As an application we consider two-field hybrid inflation. We then derive a formalism not based on slow roll which can be applied to models in which the slow-roll parameters become large before inflation ends. An exactly soluble two-field model is given in which this happens. Finally we also consider further non-Gaussian observables; a scale dependence of f_NL and the trispectrum.

Affiliated with

Also associated with

No associations

Rating

Review of local non-Gaussianity from multi-field inflation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Review of local non-Gaussianity from multi-field inflation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Review of local non-Gaussianity from multi-field inflation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-598531