Passive Curvaton
Cosmology and Nongalactic Astrophysics
2015-06-11 v2 High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
We propose a class of curvaton models which we call passive curvaton. In this paper, two kinds of passive curvaton is considered. The first one is a pseudoscalar curvaton couples to a gauge field. Different from the inflaton case, the constraint from formation of primordial black holes (PBHs) is much weaker and large non-gaussianity (of the equiliteral type) can be produced. The second model is a dilaton-like scalar curvaton couples to a gauge field. We investigate the scale dependence of non-gaussianity in this model. In both models, the spectrum and non-Gaussianity are enhanced by the slow-roll parameter of the curvaton field. Other possible passive curvaton models are also mentioned.
Cite
@article{arxiv.1210.3421,
title = {Passive Curvaton},
author = {Chia-Min Lin},
journal= {arXiv preprint arXiv:1210.3421},
year = {2015}
}
Comments
9 pages, 2 figures, to appear in PLB