Hunting for Isocurvature Modes in the CMB non-Gaussianities

Details Hunting for Isocurvature Modes in the CMB non-Gaussianities Hunting for Isocurvature Modes in the CMB non-Gaussianities

2011-04-13

arxiv.org/abs/1104.2567v2

Class. Quant. Grav. 28 (2011) 222001

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, 2 figures

Scientific paper

We investigate new shapes of local primordial non-Gaussianities in the CMB. Allowing for a primordial isocurvature mode along with the main adiabatic one, the angular bispectrum is in general a superposition of six distinct shapes: the usual adiabatic term, a purely isocurvature component and four additional components that arise from correlations between the adiabatic and isocurvature modes. We present a class of early Universe models in which various hierarchies between these six components can be obtained, while satisfying the present upper bound on the isocurvature fraction in the power spectrum. Remarkably, even with this constraint, detectable non-Gaussianity could be produced by isocurvature modes. We finally discuss the prospects of detecting these new shapes with the Planck satellite.

Affiliated with

Also associated with

No associations

Rating

Hunting for Isocurvature Modes in the CMB non-Gaussianities 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 Hunting for Isocurvature Modes in the CMB non-Gaussianities, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hunting for Isocurvature Modes in the CMB non-Gaussianities will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-219790