Ravenni, AndreaVerde, LiciaCuesta, Antonio J.2017-11-302017-11-302016-08-121475-7516https://hdl.handle.net/2445/118327We present a minimally parametric, model independent reconstruction of the shape of the primordial power spectrum. Our smoothing spline technique is well-suited to search for smooth features such as deviations from scale invariance, and deviations from a power law such as running of the spectral index or small-scale power suppression. We use a comprehensive set of the state-of the art cosmological data: Planck observations of the temperature and polarisation anisotropies of the cosmic microwave background, WiggleZ and Sloan Digital Sky Survey Data Release 7 galaxy power spectra and the Canada-France-Hawaii Lensing Survey correlation function. This reconstruction strongly supports the evidence for a power law primordial power spectrum with a red tilt and disfavours deviations from a power law power spectrum including small-scale power suppression such as that induced by significantly massive neutrinos. This offers a powerful confirmation of the inflationary paradigm, justifying the adoption of the inflationary prior in cosmological analyses.20 p.application/pdfeng(c) IOP Publishing Ltd and Sissa Medialab srl, 2016CosmologiaCosmologyinfo:eu-repo/semantics/article6624252017-11-30info:eu-repo/semantics/openAccess