2013/12/31 by POLARBEAR Collaboration, P. A. R. Ade, Y. Akiba +73 · 1 citation
Physics and Astronomy · #astro-ph.CO
paper · pdf · doi:10.1103/physrevlett.112.131302
published as Phys. Rev. Lett. 112, 131302 (2014) · 6 pages, 2 figures. v2: replaced with version accepted for publication in Physical Review Letters. The companion paper (arXiv:1312.6646) describes a measurement of the polarization lensing power spectrum
arxiv created 2014/03/08 · arxiv updated 2014/04/23
We reconstruct the gravitational lensing convergence signal from Cosmic Microwave Background (CMB) polarization data taken by the POLARBEAR experiment and cross-correlate it with Cosmic Infrared Background (CIB) maps from the Herschel satellite. From the cross-spectra, we obtain evidence for gravitational lensing of the CMB polarization at a statistical significance of 4.0σ and evidence for the presence of a lensing B-mode signal at a significance of 2.3σ. We demonstrate that our results are not biased by instrumental and astrophysical systematic errors by performing null-tests, checks with simulated and real data, and analytical calculations. This measurement of polarization lensing, made via the robust cross-correlation channel, not only reinforces POLARBEAR auto-correlation measurements, but also represents one of the early steps towards establishing CMB polarization lensing as a powerful new probe of cosmology and astrophysics.