Flat Tree-level Inflationary Potentials in Light of CMB and LSS Data

Details Flat Tree-level Inflationary Potentials in Light of CMB and LSS Data Flat Tree-level Inflationary Potentials in Light of CMB and LSS Data

2007-11-21

arxiv.org/abs/0711.3436v1

JCAP 0803:018,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

42 LaTeX pages, 8 figures

Scientific paper

10.1088/1475-7516/2008/03/018

We use cosmic microwave background and large scale structure data to test a broad and physically well-motivated class of inflationary models: those with flat tree-level potentials (typical in supersymmetry). The non-trivial features of the potential arise from radiative corrections which give a simple logarithmic dependence on the inflaton field, making the models very predictive. We also consider a modified scenario with new physics beyond a certain high-energy cut-off showing up as non-renormalizable operators (NRO) in the inflaton field. We find that both kinds of models fit remarkably well CMB and LSS data, with very few free parameters. Besides, a large part of these models naturally predict a reasonable number of e-folds. A robust feature of these scenarios is the smallness of tensor perturbations (r < 10^{-3}). The NRO case can give a sizeable running of the spectral index while achieving a sufficient number of e-folds. We use Bayesian model comparison tools to assess the relative performance of the models. We believe that these scenarios can be considered as a standard physical class of inflationary models, on a similar footing with monomial potentials.

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