Planck 2013 results
Free Access

Fig. 14


Observable range of the best fitting inflaton potentials, when V(φ) is Taylor expanded to nth order around the pivot value φ, in natural units (where assuming a flat prior on ϵV, ηV, , and , and using Planck+WP data. Potentials obtained under the transformation (φφ) → (φφ) leave the same observable signature and are also allowed. The sparsity of potentials with a small V0 = V(φ) is explained by the flat prior on ϵV rather than on ln(V0). In fact, V0 is unbounded from below.

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