Can the curvaton paradigm accommodate a low inflation scale?
Abstract
The cosmological curvature perturbation may be generated when some `curvaton' field, different from the inflaton, oscillates in a background of unperturbed radiation. In its simplest form the curvaton paradigm requires the Hubble parameter during inflation to be bigger than , but this bound may be evaded if the curvaton field (or an associated tachyon) is strongly coupled to a field which acquires a large value at the end of inflation. As a result the curvaton paradigm might be useful in improving the viability of low-scale inflation models, in which the supersymmetry-breaking mechanism is the same as the one which operates in the vacuum.
Cite
@article{arxiv.hep-th/0308110,
title = {Can the curvaton paradigm accommodate a low inflation scale?},
author = {David H. Lyth},
journal= {arXiv preprint arXiv:hep-th/0308110},
year = {2008}
}
Comments
8 pages. This version will appear in PLB, contains another inequality with no essential change in the conclusion