A Measurement of Gravitational Lensing of the Microwave Background Using South Pole Telescope Data

van Engelen, A. and Keisler, R. and Zahn, O. and Aird, K.~A. and Benson, B.~A. and Bleem, L.~E. and Carlstrom, J.~E. and Chang, C.~L. and Cho, H.~M. a

Keywords

cosmic background radiation, cosmological parameters, cosmology: observations, gravitational lensing: weak, large-scale structure of universe

Abstract

We use South Pole Telescope data from 2008 and 2009 to detect the non-Gaussian signature in the cosmic microwave background (CMB) produced by gravitational lensing and to measure the power spectrum of the projected gravitational potential. We constrain the ratio of the measured amplitude of the lensing signal to that expected in a fiducial LCDM cosmological model to be 0.86 _s16/- 0.16, with no lensing disfavored at 6.3 sigma. Marginalizing over LCDM cosmological models allowed by the WMAP7 results in a measurement of A_lens=0.90_s16/-0.19, indicating that the amplitude of matter fluctuations over the redshift range 0.5

A Measurement of Gravitational Lensing of the Microwave Background Using South Pole Telescope Data

Keywords

Abstract

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