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We present a minimally-parametric reconstruction of the primordial powerspectrum using the most recent cosmic microwave background and large scalestructure data sets. Our goal is to constrain the shape of the power spectrumwhile simultaneously avoiding strong theoretical priors and over-fitting of thedata. We find no evidence for any departure from a power law spectral index. Wealso find that an exact scale-invariant power spectrum is disfavored by thedata, but this conclusion is weaker than the corresponding result assuming atheoretically-motivated power law spectral index prior. The reconstructionshows that better data are crucial to justify the adoption of such a strongtheoretical prior observationally. These results can be used to determine therobustness of our present knowledge when compared with forthcoming precisiondata from Planck.

The Shape of the Primordial Power Spectrum: A Last Stand Before Planck