Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-07-02
Mon. Not. Roy. Astron. Soc.404:1505-1511, 2010
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
7 pages, 3 figures
Scientific paper
10.1111/j.1365-2966.2010.16362.x
We study the extent to which one can distinguish primordial non--Gaussianity (NG) arising from adiabatic and isocurvature perturbations. We make a joint analysis of different NG models based on various inflationary scenarios: local-type and equilateral-type NG from adiabatic perturbations and local-type and quadratic-type NG from isocurvature perturbations together with a foreground contamination by point sources. We separate the Fisher information of the bispectrum of CMB temperature and polarization maps by l for the skew spectrum estimator introduced by Munshi & Heavens (2009) to study the scale dependence of the signal-to-noise ratio of different NG components and their correlations. We find that the adiabatic and the isocurvature modes are strongly correlated, though the phase difference of acoustic oscillations helps to distinguish them. The correlation between local-and equilateral-type is weak, but the two isocurvature modes are too strongly correlated to be discriminated. Point source contamination, to the extent to which it can be regarded as white noise, can be almost completely separated from the primordial components for l>100. Including correlations among the different components, we find that the errors of the NG parameters increase by 20-30% for the WMAP 5-year observation, but 5% for Planck observations.
Coles Peter
Heavens Alan
Hikage Chiaki
Munshi Dipak
No associations
LandOfFree
Adiabatic versus Isocurvature Non--Gaussianity 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 Adiabatic versus Isocurvature Non--Gaussianity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adiabatic versus Isocurvature Non--Gaussianity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-730664