Planck 2013 results
Free Access

Fig. 12


Posterior distribution for the first three slow-roll potential parameters using Planck+WP data. In the n = 2 − 4 cases, the inflaton potential is expanded to nth order, and the spectrum is obtained by fitting the numerically computed power spectrum to the data, with no slow-roll approximation and no assumption about the extrapolation of the potential outside the observable window.

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