Impact of nonlinear growth of the large-scale structure on CMB -mode delensing
Abstract
We study the impact of the nonlinear growth of the large-scale structure (LSS) on the removal of the gravitational lensing effect (delensing) in cosmic microwave background (CMB) B modes. The importance of the nonlinear growth of the LSS in the gravitational lensing analysis of CMB has been recently recognized by several works, while its impact on delensing is not yet explored. The delensing using mass-tracers such as galaxies and cosmic infrared background (CIB) could be also affected by the nonlinear growth. We find that the nonlinear growth of the LSS leads to ~ 0:3% corrections to B-mode spectrum after delensing with a high-z mass tracer (zm ~ 2) at $$l$$ = 1000-2000. The off-diagonal correlation coefficients of the lensing B-mode template spectrum become significant for delensing with low-z tracers (zm ≲ 0:5), but are negligible with high-z tracers (such as CIB). On the other hand, the power spectrum covariance of the delensed B mode is not significantly affected by the nonlinear growth of the LSS, and the delensing efficiency is not significantly changed even if we use low-z tracers. The CMB B-mode internal delensing is also not significantly affected by the nonlinear growth.
- Authors:
-
- National Taiwan Univ., Taipei (Taiwan)
- Hirosaki Univ. (Japan)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1544129
- Alternate Identifier(s):
- OSTI ID: 1492466
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 2; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Namikawa, Toshiya, and Takahashi, Ryuichi. Impact of nonlinear growth of the large-scale structure on CMB B -mode delensing. United States: N. p., 2019.
Web. doi:10.1103/PhysRevD.99.023530.
Namikawa, Toshiya, & Takahashi, Ryuichi. Impact of nonlinear growth of the large-scale structure on CMB B -mode delensing. United States. https://doi.org/10.1103/PhysRevD.99.023530
Namikawa, Toshiya, and Takahashi, Ryuichi. Mon .
"Impact of nonlinear growth of the large-scale structure on CMB B -mode delensing". United States. https://doi.org/10.1103/PhysRevD.99.023530. https://www.osti.gov/servlets/purl/1544129.
@article{osti_1544129,
title = {Impact of nonlinear growth of the large-scale structure on CMB B -mode delensing},
author = {Namikawa, Toshiya and Takahashi, Ryuichi},
abstractNote = {We study the impact of the nonlinear growth of the large-scale structure (LSS) on the removal of the gravitational lensing effect (delensing) in cosmic microwave background (CMB) B modes. The importance of the nonlinear growth of the LSS in the gravitational lensing analysis of CMB has been recently recognized by several works, while its impact on delensing is not yet explored. The delensing using mass-tracers such as galaxies and cosmic infrared background (CIB) could be also affected by the nonlinear growth. We find that the nonlinear growth of the LSS leads to ~ 0:3% corrections to B-mode spectrum after delensing with a high-z mass tracer (zm ~ 2) at $l$ = 1000-2000. The off-diagonal correlation coefficients of the lensing B-mode template spectrum become significant for delensing with low-z tracers (zm ≲ 0:5), but are negligible with high-z tracers (such as CIB). On the other hand, the power spectrum covariance of the delensed B mode is not significantly affected by the nonlinear growth of the LSS, and the delensing efficiency is not significantly changed even if we use low-z tracers. The CMB B-mode internal delensing is also not significantly affected by the nonlinear growth.},
doi = {10.1103/PhysRevD.99.023530},
journal = {Physical Review D},
number = 2,
volume = 99,
place = {United States},
year = {Mon Jan 28 00:00:00 EST 2019},
month = {Mon Jan 28 00:00:00 EST 2019}
}
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