4.6 Article

The curvaton web

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IOP Publishing Ltd
DOI: 10.1088/1475-7516/2006/04/009

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cosmological perturbation theory; inflation

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We discuss nontrivial features of the large scale structure of the universe in the simplest curvaton model proposed in our paper astro-ph/9610219. The amplitude of metric perturbations in this model takes different values in different parts of the universe. The spatial distribution of the amplitude looks like a web consisting of exponentially large cells. Depending on the relation between the cell size lambda(0) and the scale of the horizon l(H), one may either live in a part of the universe dominated by Gaussian perturbations (inside a cell with lambda(0)>> l(H)), or in the universe dominated by non-Gaussian perturbations (for lambda(0)>> l(H)). We show that the curvaton contribution to the total amplitude of adiabatic density perturbations can be strongly suppressed if the energy density of the universe prior to the curvaton decay was dominated not by the classical curvaton field but by the curvaton particles produced during reheating. We describe the curvaton inflaton transmutation effect: the same field in different parts of the universe may play either the role of the curvaton or the role of the inflaton. Finally, we discuss an interplay between the curvaton web and anthropic considerations in the string theory landscape.

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