Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-06-21
Phys.Rev.D83:023527,2011
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
1+14 pages, 5 figures
Scientific paper
10.1103/PhysRevD.83.023527
We demonstrate novel features in the behavior of the second and third order non-linearity parameters of the curvature perturbation, namely, $f_{NL}$ and $g_{NL}$, arising from non-linear motion of curvaton field. We investigate two classes of potentials for the curvaton - the first has tiny oscillations super-imposed upon the quadratic potential. The second is characterized by a single 'feature' separating two quadratic regimes with different mass scales. The feature may either be a bump or a flattening of the potential. In the case of the oscillatory potential we find that as the width and height of superimposed oscillations increase, both $f_{NL}$ and $g_{NL}$ deviate strongly from their expected values from a quadratic potential. $f_{NL}$ changes sign from positive to negative as the oscillations in the potential become more prominent. Hence, this model can be severely constrained by convincing evidence from observations that $f_{NL}$ is positive. $g_{NL}$, on the other hand, acquires very large negative values. For the the single feature potential, we find that $f_{NL}$ and $g_{NL}$ exhibit oscillatory behavior as a function of the parameter that controls the feature.
Chingangbam Pravabati
Huang Qing-Guo
No associations
LandOfFree
New features in curvaton model 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 New features in curvaton model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New features in curvaton model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-600911