CMB internal delensing with general optimal estimator for higher-order correlations
Abstract
We present here a new method for delensing B modes of the cosmic microwave background (CMB) using a lensing potential reconstructed from the same realization of the CMB polarization (CMB internal delensing). The B -mode delensing is required to improve sensitivity to primary B modes generated by, e.g., the inflationary gravitational waves, axionlike particles, modified gravity, primordial magnetic fields, and topological defects such as cosmic strings. However, the CMB internal delensing suffers from substantial biases due to correlations between observed CMB maps to be delensed and that used for reconstructing a lensing potential. Since the bias depends on realizations, we construct a realization-dependent (RD) estimator for correcting these biases by deriving a general optimal estimator for higher-order correlations. The RD method is less sensitive to simulation uncertainties. Compared to the previous ℓ -splitting method, we find that the RD method corrects the biases without substantial degradation of the delensing efficiency.
- Authors:
-
- Stanford Univ., CA (United States). Dept. of Physics; Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology; SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1369439
- Alternate Identifier(s):
- OSTI ID: 1372552
- Grant/Contract Number:
- AC02-76SF00515; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 95; Journal Issue: 10; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Gravitational lenses; Gravitational wave detection; cosmic microwave background; CMB
Citation Formats
Namikawa, Toshiya. CMB internal delensing with general optimal estimator for higher-order correlations. United States: N. p., 2017.
Web. doi:10.1103/PhysRevD.95.103514.
Namikawa, Toshiya. CMB internal delensing with general optimal estimator for higher-order correlations. United States. https://doi.org/10.1103/PhysRevD.95.103514
Namikawa, Toshiya. Wed .
"CMB internal delensing with general optimal estimator for higher-order correlations". United States. https://doi.org/10.1103/PhysRevD.95.103514. https://www.osti.gov/servlets/purl/1369439.
@article{osti_1369439,
title = {CMB internal delensing with general optimal estimator for higher-order correlations},
author = {Namikawa, Toshiya},
abstractNote = {We present here a new method for delensing B modes of the cosmic microwave background (CMB) using a lensing potential reconstructed from the same realization of the CMB polarization (CMB internal delensing). The B -mode delensing is required to improve sensitivity to primary B modes generated by, e.g., the inflationary gravitational waves, axionlike particles, modified gravity, primordial magnetic fields, and topological defects such as cosmic strings. However, the CMB internal delensing suffers from substantial biases due to correlations between observed CMB maps to be delensed and that used for reconstructing a lensing potential. Since the bias depends on realizations, we construct a realization-dependent (RD) estimator for correcting these biases by deriving a general optimal estimator for higher-order correlations. The RD method is less sensitive to simulation uncertainties. Compared to the previous ℓ -splitting method, we find that the RD method corrects the biases without substantial degradation of the delensing efficiency.},
doi = {10.1103/PhysRevD.95.103514},
journal = {Physical Review D},
number = 10,
volume = 95,
place = {United States},
year = {Wed May 24 00:00:00 EDT 2017},
month = {Wed May 24 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
CMB delensing beyond the B modes
journal, December 2017
- Green, Daniel; Meyers, Joel; Engelen, Alexander van
- Journal of Cosmology and Astroparticle Physics, Vol. 2017, Issue 12
CMB Polarization B -mode Delensing with SPTpol and Herschel
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CMB Polarization B-mode Delensing with SPTpol and Herschel
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