Non-Gaussianity in curvaton models with nearly quadratic potentials

By K. Enqvist, Sami Nurmi. 2005

144 citations recorded by the source corpus.

We consider curvaton models with potentials that depart slightly from the quadratic form. We show that although such a small departure does not significantly modify the Gaussian part of the curvature perturbation, it can have a pronounced effect on the level of non-Gaussianity. We find that unlike in the quadratic case, the limit of small non-Gaussianity, , is quite possible even with small curvaton energy density . Furthermore, non-Gaussianity does not imply any strict bounds on r, but the bounds depend on the assumptions about the higher order terms in the curvaton potential.

Subfields: Applied Mathematics, Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/532f4d48fdf5d3ff2a31671094365348e34664ae

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Applied Mathematics

1. Kiwoon Choi
2. Yi Wang
3. C. Byrnes

In Astronomy and Astrophysics

1. Kiwoon Choi
2. C. Byrnes
3. Yi Wang
4. Xingang Chen
5. D. Baumann
6. D. Seery
7. D. Wands
8. E. Pajer

In Nuclear and High Energy Physics

1. Kiwoon Choi
2. C. Byrnes
3. Yi Wang
4. Xingang Chen
5. D. Baumann
6. D. Wands
7. S. Young
8. D. Green

Citations in the corpus

• Inflation, Cosmic Perturbations and Non-Gaussianities (2013, background): “[183] K.”
• Review of local non-Gaussianity from multi-field inflation (2010, result): “In contrast, it has been shown in several papers [127, 138–142] that in the curvaton scenario where the curvaton has a nonquadratic potential it is possible to realise |gNL| 1 while τNL = (6 fNL/5) 2 is small with some tuning of parameters.”