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Title: Lensing reconstruction from a patchwork of polarization maps
Authors: Namikawa, Toshiya
Nagata, Ryo
Author's alias: 並河, 俊弥
Keywords: CMBR polarisation
gravitational waves and CMBR polarization
weak gravitational lensing
Issue Date: 5-Sep-2014
Publisher: IOP Publishing
Journal title: Journal of Cosmology and Astroparticle Physics
Volume: 17
Issue: 9
Start page: 629
End page: 632
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.
Rights: This is an author-created, un-copyedited version of an article accepted for publication in 'Journal of Cosmology and Astroparticle Physics'. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
DOI(Published Version): 10.1088/1475-7516/2014/09/009
PubMed ID: 25204480
Appears in Collections:Journal Articles

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