Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-11-04
Phys.Rev.D69:063508,2004
Astronomy and Astrophysics
Astrophysics
8 pages. Minor changes to text, references added, matches version to appear in PRD
Scientific paper
10.1103/PhysRevD.69.063508
In the curvaton model of inflation, where a second scalar field, the "curvaton", is responsible for the observed inhomogeneity, a non-zero neutrino degeneracy may lead to a characteristic pattern of isocurvature perturbations in the neutrino, cold dark matter and baryon components. We find the current data can only place upper limits on the level of isocurvature perturbations. These can be translated into upper limits on the neutrino degeneracy parameter. In the case that lepton number is created before curvaton decay, we find that the limit on the neutrino degeneracy parameter is comparable with that obtained from Big-bang nucleosynthesis. For the case that lepton number is created by curvaton decay we find that the absolute value of the non-Gaussianity parameter, |f_nl|, must be less than 10 (95% confidence interval).
Gordon Christopher
Malik Karim A.
No associations
LandOfFree
WMAP, neutrino degeneracy and non-Gaussianity constraints on isocurvature perturbations in the curvaton model of 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 WMAP, neutrino degeneracy and non-Gaussianity constraints on isocurvature perturbations in the curvaton model of inflation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and WMAP, neutrino degeneracy and non-Gaussianity constraints on isocurvature perturbations in the curvaton model of inflation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-627560