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19 April 2024

» arxiv » 1606.1968

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BICEP2 / Keck Array VIII: Measurement of gravitational lensing from large-scale B-mode polarization
Keck Array ; BICEP2 Collaborations ; P. A. R. Ade ; Z. Ahmed ; R. W. Aikin ; K. D. Alexander ; D. Barkats ; S. J. Benton ; C. A. Bischoff ; J. J. Bock ; R. Bowens-Rubin ; J. A. Brevik ; I. Buder ; E. Bullock ; V. Buza ; J. Connors ; B. P. Crill ; L. Duband ; C. Dvorkin ; J. P. Filippin ; S. Fliescher ; J. Grayson ; M. Halpern ; S. Harrison ; S. R. Hildebrandt ; G. C. Hilton ; H. Hui ; K. D. Irwin ; J. Kang ; K. S. Karkare ; E. Karpel ; J. P. Kaufman ; B. G. Keating ; S. Kefeli ; S. A. Kernasovskiy ; J. M. Kovac ; C. L. Kuo ; E. M. Leitch ; M. Lueker ; K. G. Megerian ; T. Namikawa ; C. B. Netterfield ; H. T. Nguyen ; R. O'Brient ; R. W. Ogburn IV ; A. Orlando ; C. Pryke ; S. Richter ; R. Schwarz ; C. D. Sheehy ; Z. K. Staniszewski ; B. Steinbach ; R. V. Sudiwala ; G. P. Teply ; K. L. Thompson ; J. E. Tolan ; C. Tucker ; A. D. Turner ; A. G. Vieregg ; A. C. Weber ; D. V. Wiebe ; J. Willmert ; C. L. Wong ; W. L. K. Wu ; K. W. Yoon ;
Date:	7 Jun 2016
Abstract:	We present measurements of polarization lensing using the 150 GHz maps which include all data taken by the BICEP2 & Keck Array CMB polarization experiments up to and including the 2014 observing season (BK14). Despite their modest angular resolution ($sim 0.5^circ$), the excellent sensitivity ($sim 3mu$K-arcmin) of these maps makes it possible to directly reconstruct the lensing potential using only information at larger angular scales ($ellleq 700$). From the auto-spectrum of the reconstructed potential we measure an amplitude of the spectrum to be $A^{phiphi}_{ m L}=1.15pm 0.36$ (Planck $Lambda$CDM prediction corresponds to $A^{phiphi}_{ m L}=1$), and reject the no-lensing hypothesis at 5.8$sigma$, which is the highest significance achieved to date using EB lensing estimator. Taking the cross-spectrum of the reconstructed potential with the Planck 2015 lensing map yields $A^{phiphi}_{ m L}=1.13pm 0.20$. These direct measurements of $A^{phiphi}_L$ are consistent with the $Lambda$CDM cosmology, and with that derived from the previously reported BK14 B-mode auto-spectrum ($A^{ m BB}_{ m L}=1.20pm 0.17$). We perform a series of null tests and consistency checks to show that these results are robust against systematics and are insensitive to analysis choices. These results unambiguously demonstrate that the B-modes previously reported by BICEP / Keck at intermediate angular scales ($150lesssimelllesssim 350$) are dominated by gravitational lensing. The good agreement between the lensing amplitudes obtained from the lensing reconstruction and B-mode spectrum starts to place constraints on any alternative cosmological sources of B-modes at these angular scales.
Source:	arXiv, 1606.1968
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