The self-interacting curvaton

Details The self-interacting curvaton The self-interacting curvaton

2010-12-08

arxiv.org/abs/1012.1711v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Invited talk given at the YKIS2010 symposium, Kyoto, Japan, July 2010, to appear in the Progress of Theoretical Physics Supple

Scientific paper

The evolution of the curvature perturbation is highly non-trivial for curvaton models with self-interactions and is very sensitive to the parameter values. The final perturbation depends also on the curvaton decay rate $\Gamma$. As a consequence, non-gaussianities can be greatly different from the purely quadratic case, even if the deviation is very small. Here we consider a class of polynomial curvaton potentials and discuss the dynamical behavior of the curvature perturbation. We point out that, for example, it is possible that the non-gaussianity parameter $\fnl\simeq 0$ while $\gnl$ is non-zero. In the case of a curvaton with mass $m\sim {\cal O}(1)$ TeV we show that one cannot ignore non-quadratic terms in the potential, and that only a self-interaction of the type $V_{\rm int}=\sigma^8/M^4$ is consistent with various theoretical and observational constraints. Moreover, the curvaton decay rate should then be in the range $\Gamma=10^{-15}- 10^{-17}$ GeV.

Affiliated with

Also associated with

No associations

Rating

The self-interacting curvaton 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 The self-interacting curvaton, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The self-interacting curvaton will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-558386