| Literature DB >> 24138230 |
D Hanson1, 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 T Story, C Tucker, K Vanderlinde, J D Vieira, M P Viero, G Wang, V Yefremenko, O Zahn, M Zemcov.
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 nonzero correlation at 7.7σ 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.Year: 2013 PMID： 24138230 DOI： 10.1103/PhysRevLett.111.141301
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161