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2011

Reconstruction of the primordial power spectrum from CMB data

Guo, Zong-Kuan, Schwarz, Dominik J., Zhang, Yuan-Zhong

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Measuring the deviation from scale invariance of the primordial power spectrum is a critical test of inflation.

In this paper we reconstruct the shape of the primordial power spectrum of curvature perturbations from the cosmic microwave background data, including the 7-year Wilkinson Microwave Anisotropy Probe data and the Atacama Cosmology Telescope 148 GHz data, by using a binning method of a cubic spline interpolation in log-log space.
We find that the power-law spectrum is preferred by the data and 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.

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