Abstract
Measuring the deviation from scale invariance of the primordialpower spectrum is a critical test of inflation.In this paper we reconstruct the shape of the primordial power spectrum ofcurvature perturbations from the cosmic microwave backgrounddata, including the 7-year Wilkinson Microwave AnisotropyProbe data and the Atacama Cosmology Telescope 148 GHz data,by using a binning method of a cubic spline interpolation inlog-log space.We find that the power-law spectrum is preferred by the dataand that the Harrison-Zel'dovich spectrum is disfavored at 95%confidence level. These conclusions hold with and without allowing for tensor modes, however the simpler model without tensors is preferred by the data. We do not find evidence for a feature in the primordial power spectrum — in full agreement with generic predictions from cosmological inflation.
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