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Low scale inflation and the curvaton mechanism

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arxiv hep-ph/0411119 v3 pith:PT3TRI5K submitted 2004-11-08 hep-ph astro-ph

Low scale inflation and the curvaton mechanism

Konstantinos Dimopoulos (1) , David H. Lyth (1) , Yeinzon Rodriguez (1 , 2) ((1) Department of Physics Lancaster University , (2) Centro de Investigaciones Universidad Antonio Narino) This is my paper
classification hep-ph astro-ph
keywords curvatoninflationscalebeforedominateslowermodelallow
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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>10^7 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 be attained.

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Cited by 1 Pith paper

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    Computes perturbation amplitudes in general effective multi-field inflation without sub-horizon limit and bounds higher-derivative corrections via ε for finite-cutoff models.