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We use cosmic microwave background and large scale structure data to test abroad and physically well-motivated class of inflationary models: those withflat tree-level potentials (typical in supersymmetry). The non-trivial featuresof the potential arise from radiative corrections which give a simplelogarithmic dependence on the inflaton field, making the models verypredictive. We also consider a modified scenario with new physics beyond acertain high-energy cut-off showing up as non-renormalizable operators (NRO) inthe inflaton field. We find that both kinds of models fit remarkably well CMBand LSS data, with very few free parameters. Besides, a large part of thesemodels naturally predict a reasonable number of e-folds. A robust feature ofthese scenarios is the smallness of tensor perturbations (r < 10^{-3}). The NROcase can give a sizeable running of the spectral index while achieving asufficient number of e-folds. We use Bayesian model comparison tools to assessthe relative performance of the models. We believe that these scenarios can beconsidered as a standard physical class of inflationary models, on a similarfooting with monomial potentials.

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