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We reconstruct the power spectrum of primordial curvature perturbations byapplying a well-validated non-parametric technique employing Tikhonovregularisation to the first data release from the Planck satellite. To improvethe reconstruction on small spatial scales we include data from theground-based ACT and SPT experiments, the WiggleZ galaxy redshift survey, theCFHTLenS tomographic weak lensing survey, and spectral analysis of theLyman-alpha forest. The reconstructed scalar spectrum (assuming the standardLCDM cosmology) is not scale-free but has an infrared cutoff at k < 5 x 10^-4Mpc^-1 and several ~2-3 sigma features, of which two at wavenumber k/Mpc^-1 ~0.0018 and 0.057 had been seen already in WMAP data. A higher significancefeature at k ~ 0.12 Mpc^-1 is indicated by Planck data, but may be sensitive tothe systematic uncertainty around multipole l ~ 1800 in the 217x217 GHzcross-spectrum. In any case accounting for the 'look elsewhere' effect dropsits global significance to ~2 sigma.

Search for features in the spectrum of primordial perturbations using Planck and other datasets