Journal
CLASSICAL AND QUANTUM GRAVITY
Volume 28, Issue 22, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0264-9381/28/22/222001
Keywords
-
Categories
Funding
- ANR [ANR-09-BLAN-0157]
Ask authors/readers for more resources
We investigate new shapes (in multipole space) of local primordial non-Gaussianities in the cosmic microwave background. 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 the 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 data, including polarization.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available