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18 April 2024

» arxiv » 1307.5830

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Detection of B-mode Polarization in the Cosmic Microwave Background with Data from the South Pole Telescope
D. Hanson ; S. Hoover ; A. Crites ; P. A. R. Ade ; K. A. Aird ; J. E. Austermann ; J. A. Beall ; A. N. Bender ; B. A. Benson ; L. E. Bleem ; J. J. Bock ; J. E. Carlstrom ; C. L. Chang ; H. C. Chiang ; H-M. Cho ; A. Conley ; T. M. Crawford ; T. de Haan ; M. A. Dobbs ; W. Everett ; J. Gallicchio ; J. Gao ; E. M. George ; N. W. Halverson ; N. Harrington ; J. W. Henning ; G. C. Hilton ; G. P. Holder ; W. L. Holzapfel ; J. D. Hrubes ; N. Huang ; J. Hubmayr ; K. D. Irwin ; R. Keisler ; L. Knox ; A. T. Lee ; E. Leitch ; D. Li ; C. Liang ; D. Luong-Van ; G. Marsden ; J. J. McMahon ; J. Mehl ; S. S. Meyer ; L. Mocanu ; T. E. Montroy ; T. Natoli ; J. P. Nibarger ; V. Novosad ; S. Padin ; C. Pryke ; C. L. Reichardt ; J. E. Ruhl ; B. R. Saliwanchik ; J. T. Sayre ; K. K. Schaffer ; B. Schulz ; G. Smecher ; A. A. Stark ; K. Story ; C. Tucker ; K. Vanderlinde ; J. D. Vieira ; M. P. Viero ; G. Wang ; V. Yefremenko ; O. Zahn ; M. Zemcov ;
Date:	22 Jul 2013
Abstract:	Gravitational lensing of the cosmic microwave background generates a curl pattern in the observed polarization. This "B-mode" signal provides a measure of the projected mass distribution over the entire observable Universe and also acts as a contaminant for the measurement of primordial gravity-wave signals. In this letter we present the first detection of gravitational lensing B modes, using first-season data from the polarization-sensitive receiver on the South Pole Telescope (SPTpol). We construct a template for the lensing B-mode signal by combining E-mode polarization measured by SPTpol with estimates of the lensing potential from a Herschel-SPIRE map of the cosmic infrared background. We compare this template to the B modes measured directly by SPTpol, finding a non-zero correlation at 7.7 sigma significance. The correlation has an amplitude and scale-dependence consistent with theoretical expectations, is robust with respect to analysis choices, and constitutes the first measurement of a powerful cosmological observable.
Source:	arXiv, 1307.5830
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