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Home > Research > Publications & Outputs > Low scale inflation and the curvaton mechanism.
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Low scale inflation and the curvaton mechanism.

Research output: Contribution to journalJournal article

Published

Journal publication date11/03/2005
JournalJournal of High Energy Physics
Journal number02
Volume2005
Pages055
Original languageEnglish

Abstract

The primordial curvature perturbation may be due to a `curvaton' field, which dominates (or almost dominates) the energy density before it decays. In the simplest version of the curvaton model the scale of inflation has to be quite high corresponding to a Hubble parameter H > 107 GeV. We here explore two modifications of the curvaton model which can instead allow inflation at a low scale. (i) The curvaton is a Pseudo Nambu-Goldstone Boson (PNGB), with a symmetry-breaking phase transition during inflation. (ii) The curvaton mass increases suddenly at some moment after the end of inflation but before the onset of the curvaton oscillations. Both proposals can work but not in a completely natural way. Also, the lower bound on the scale of inflation depends somewhat on the details of the framework used. Nevertheless, we show that inflation with H as low as 1 TeV or lower is possible to attain.