Planck 2018 results
Open Access

Fig. 27.


Top: reconstructed shape of the single-field inflaton potential from the cubic-spline power spectra mode-expansion using 12 knots and the Planck TT,TE,EE+lowE+lensing+BK15+BAO data. Bottom: result when r is fixed at 0.001. Instead of plotting as a function of wavenumber k we plot lnV(ϕ)/Vpivot about a pivot field value ϕpivot. Note that the range on the ϕ axis is quite different for the small r case than the floating case. The probability of local convexity evaluated at ϕpivot is denoted as p(convex).

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