CMB lensing reconstruction using cut sky polarization maps and pure<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>modes

Pearson, Ruth; Sherwin, Blake D.; Lewis, Antony

doi:10.1103/physrevd.90.023539

Cited by 16 publications

(11 citation statements)

References 27 publications

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“…Unlike the lensing reconstruction from the temperature and E-mode, the mean-field bias due to the presence of the sky cut is typically small for this EB estimator with an appropriate treatment for E/B mixing (Namikawa & Takahashi 2014;Pearson et al 2014). Other non-lensing anisotropies could generate a mean-field component (e.g., ), but our simulations show that the mean-field bias is smaller than the simulation noise thatcorresponds to f A L divided by the number of realizations (see, e.g., Namikawa et al 2013).…”

Section: Estimating the Lensing Potentialmentioning

confidence: 99%

Bicep2/KECK ARRAY VIII: MEASUREMENT OF GRAVITATIONAL LENSING FROM LARGE-SCALE B-MODE POLARIZATION

Ade¹,

Ahmed²,

Aikin³

et al. 2016

ApJ

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We present measurements of polarization lensing using the 150 GHz maps, which include all data taken by the BICEP2andKeck Array Cosmic Microwave Background polarization experiments up to and including the 2014 observing season (BK14). Despite their modest angular resolution (~ 0 . 5), the excellent sensitivity (∼3μK-arcmin) of these maps makes it possible to directly reconstruct the lensing potential using only information at larger angular scales (  ℓ 700). From the auto-spectrum of the reconstructed potential, we measure an amplitude of the spectrum to be) and reject the no-lensing hypothesis at s 5.8 , which is the highest significance achieved to date using an EB lensing estimator. Taking ). 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 scales350) 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.

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Section: Estimating the Lensing Potentialmentioning

confidence: 99%

Bicep2/KECK ARRAY VIII: MEASUREMENT OF GRAVITATIONAL LENSING FROM LARGE-SCALE B-MODE POLARIZATION

Ade¹,

Ahmed²,

Aikin³

et al. 2016

ApJ

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“…We have treated the ACTPol measurement as a single effective bandpower in the Bmode power spectrum with amplitude relative to fiducial of A = 1.30 ± 0.40. We place this single effective bandpower at l = 1000, near the center of the distribution for lensing information with the EB lensing estimator (Pearson et al 2014). …”

Section: Consistency With Other Surveysmentioning

confidence: 99%

The Atacama Cosmology Telescope: Lensing of CMB Temperature and Polarization Derived From Cosmic Infrared Background Cross-Correlation

Engelen

Sherwin

Sehgal

et al. 2015

ApJ

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We present a measurement of the gravitational lensing of the Cosmic Microwave Background (CMB) temperature and polarization fields obtained by cross-correlating the reconstructed convergence signal from the first season of ACTPol data at 146 GHz with Cosmic Infrared Background (CIB) fluctuations measured using the Planck satellite. Using an overlap area of 206 square degrees, we detect gravitational lensing of the CMB polarization by large-scale structure at a statistical significance of 4.5σ. Combining both CMB temperature and polarization data gives a lensing detection at 9.1σ significance. A B-mode polarization lensing signal is present with a significance of 3.2σ. We also present the first measurement of CMB lensing-CIB correlation at small scales corresponding to l > 2000. Null tests and systematic checks show that our results are not significantly biased by astrophysical or instrumental systematic effects, including Galactic dust. Fitting our measurements to the best-fit lensing-CIB cross power spectrum measured in Planck data, scaled by an amplitude A, gives A = 1.02 +0.12 −0.08 (stat.)±0.06(syst.), consistent with the Planck results.

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“…In this paper, we consider a simple case where the total area of the patchwork map corresponds to the whole sky for the purpose of understanding how the patchwork scheme affects lensing reconstruction and delensing without confusing it with other biases from, for instance, multipole transformation in the presence of sky border (e.g., [14,15]). The HEALPix pixelization parameter (nside) is set to be 2048, which corresponds to the pixel size of 1.72 arcmin, so that we can confirm the convergence of our calculation.…”

Section: Map Simulationmentioning

confidence: 99%

Lensing reconstruction from a patchwork of polarization maps

Namikawa

Nagata

2014

J. Cosmol. Astropart. Phys.

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Abstract. The lensing signals involved in CMB polarization maps have already been measured with ground-based experiments such as SPTpol and POLARBEAR, and would become important as a probe of cosmological and astrophysical issues in the near future. Sizes of polarization maps from ground-based experiments are, however, limited by contamination of long wavelength modes of observational noise. To further extract the lensing signals, we explore feasibility of measuring lensing signals from a collection of small sky maps each of which is observed separately by a ground-based large telescope, i.e., lensing reconstruction from a patchwork map of large sky coverage organized from small sky patches. We show that, although the B-mode power spectrum obtained from the patchwork map is biased due to baseline uncertainty, bias on the lensing potential would be negligible if the B-mode on scales larger than the blowup scale of 1/f noise is removed in the lensing reconstruction. As examples of cosmological applications, we also show 1) the cross-correlations between the reconstructed lensing potential and full-sky temperature/polarization maps from satellite missions such as PLANCK and LiteBIRD, and 2) the use of the reconstructed potential for delensing B-mode polarization of LiteBIRD observation.

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CMB lensing reconstruction using cut sky polarization maps and pureBmodes

Cited by 16 publications

References 27 publications

Bicep2/KECK ARRAY VIII: MEASUREMENT OF GRAVITATIONAL LENSING FROM LARGE-SCALE B-MODE POLARIZATION

Bicep2/KECK ARRAY VIII: MEASUREMENT OF GRAVITATIONAL LENSING FROM LARGE-SCALE B-MODE POLARIZATION

The Atacama Cosmology Telescope: Lensing of CMB Temperature and Polarization Derived From Cosmic Infrared Background Cross-Correlation

Lensing reconstruction from a patchwork of polarization maps

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