skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Lensing reconstruction from a patchwork of polarization maps

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.

Authors:
 [1];  [2]
  1. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto, 606-8502 Japan (Japan)
  2. High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, 305-0801 Japan (Japan)
Publication Date:
OSTI Identifier:
22375892
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; CORRELATIONS; GRAVITATIONAL LENSES; MAPS; NOISE; POLARIZATION; POTENTIALS; SATELLITES; SIGNALS; SKY; SPECTRA; TELESCOPES; WAVELENGTHS

Citation Formats

Namikawa, Toshiya, and Nagata, Ryo, E-mail: namikawa@yukawa.kyoto-u.ac.jp, E-mail: rnagata@post.kek.jp. Lensing reconstruction from a patchwork of polarization maps. United States: N. p., 2014. Web. doi:10.1088/1475-7516/2014/09/009.
Namikawa, Toshiya, & Nagata, Ryo, E-mail: namikawa@yukawa.kyoto-u.ac.jp, E-mail: rnagata@post.kek.jp. Lensing reconstruction from a patchwork of polarization maps. United States. doi:10.1088/1475-7516/2014/09/009.
Namikawa, Toshiya, and Nagata, Ryo, E-mail: namikawa@yukawa.kyoto-u.ac.jp, E-mail: rnagata@post.kek.jp. Mon . "Lensing reconstruction from a patchwork of polarization maps". United States. doi:10.1088/1475-7516/2014/09/009.
@article{osti_22375892,
title = {Lensing reconstruction from a patchwork of polarization maps},
author = {Namikawa, Toshiya and Nagata, Ryo, E-mail: namikawa@yukawa.kyoto-u.ac.jp, E-mail: rnagata@post.kek.jp},
abstractNote = {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.},
doi = {10.1088/1475-7516/2014/09/009},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 09,
volume = 2014,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 2014},
month = {Mon Sep 01 00:00:00 EDT 2014}
}