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Detection of B-mode Polarization in the Cosmic Microwave Background with Data from the South Pole Telescope

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arxiv 1307.5830 v2 pith:ANOC7VSW submitted 2013-07-22 astro-ph.CO

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
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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
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keywords lensingb-modebackgroundcosmicpolarizationsptpolcorrelationdata
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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.

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Cited by 2 Pith papers

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  1. A comparison between Galactic magnetic field models and polarized synchrotron emission with C-BASS at 4.76 GHz and S-PASS at 2.3 GHz

    astro-ph.GA 2026-05 unverdicted novelty 3.0

    Comparison of Galactic magnetic field models to polarized synchrotron observations shows good agreement on angles but poor match on intensity, indicating local foreground structures must be incorporated.

  2. Update on the Physics of the Cosmic Microwave Background (2015-2025)

    astro-ph.CO 2026-07 conditional

    A status review of CMB science 2015-2025: the six-parameter ΛCDM model still fits the power spectra, primordial B-modes remain undetected with r < 0.036, and the Hubble tension persists at over 5σ.