Effect of non-Gaussian lensing deflections on CMB lensing measurements
Abstract
We investigate the impact of non-Gaussian lensing deflections on measurements of the CMB lensing power spectrum. We find that the false assumption of their Gaussianity significantly biases these measurements in current and future experiments at the percent level. The bias is detected by comparing CMB lensing reconstructions from simulated CMB data lensed with Gaussian deflection fields to reconstructions from simulations lensed with fully non-Gaussian deflection fields. The non-Gaussian deflections are produced by ray-tracing through snapshots of an N-body simulation and capture both the non-Gaussianity induced by non-linear structure formation and by multiple correlated deflections. We find that the amplitude of the measured bias is in agreement with analytical predictions by Bohm et al. 2016. The bias is largest in temperature-based measurements and we do not find evidence for it in measurements from a combination of polarization fields (EB;EB). We argue that the non-Gaussian bias should be even more important for measurements of cross-correlations of CMB lensing with low-redshift tracers of large-scale structure.
- Authors:
-
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of Cambridge (United Kingdom)
- Princeton Univ., NJ (United States)
- Flatiron Inst., New York, NY (United States); Inst. for Advanced Study, Princeton, NJ (United States)
- Inst. for Advanced Study, Princeton, NJ (United States)
- National Taiwan Univ., Taipei (Taiwan)
- 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:
- 1544147
- Alternate Identifier(s):
- OSTI ID: 1485734
- Grant/Contract Number:
- AC02-05CH11231; AST-1602663
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 12; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Böhm, Vanessa, Sherwin, Blake D., Liu, Jia, Hill, J. Colin, Schmittfull, Marcel, and Namikawa, Toshiya. Effect of non-Gaussian lensing deflections on CMB lensing measurements. United States: N. p., 2018.
Web. doi:10.1103/PhysRevD.98.123510.
Böhm, Vanessa, Sherwin, Blake D., Liu, Jia, Hill, J. Colin, Schmittfull, Marcel, & Namikawa, Toshiya. Effect of non-Gaussian lensing deflections on CMB lensing measurements. United States. https://doi.org/10.1103/PhysRevD.98.123510
Böhm, Vanessa, Sherwin, Blake D., Liu, Jia, Hill, J. Colin, Schmittfull, Marcel, and Namikawa, Toshiya. Sat .
"Effect of non-Gaussian lensing deflections on CMB lensing measurements". United States. https://doi.org/10.1103/PhysRevD.98.123510. https://www.osti.gov/servlets/purl/1544147.
@article{osti_1544147,
title = {Effect of non-Gaussian lensing deflections on CMB lensing measurements},
author = {Böhm, Vanessa and Sherwin, Blake D. and Liu, Jia and Hill, J. Colin and Schmittfull, Marcel and Namikawa, Toshiya},
abstractNote = {We investigate the impact of non-Gaussian lensing deflections on measurements of the CMB lensing power spectrum. We find that the false assumption of their Gaussianity significantly biases these measurements in current and future experiments at the percent level. The bias is detected by comparing CMB lensing reconstructions from simulated CMB data lensed with Gaussian deflection fields to reconstructions from simulations lensed with fully non-Gaussian deflection fields. The non-Gaussian deflections are produced by ray-tracing through snapshots of an N-body simulation and capture both the non-Gaussianity induced by non-linear structure formation and by multiple correlated deflections. We find that the amplitude of the measured bias is in agreement with analytical predictions by Bohm et al. 2016. The bias is largest in temperature-based measurements and we do not find evidence for it in measurements from a combination of polarization fields (EB;EB). We argue that the non-Gaussian bias should be even more important for measurements of cross-correlations of CMB lensing with low-redshift tracers of large-scale structure.},
doi = {10.1103/PhysRevD.98.123510},
journal = {Physical Review D},
number = 12,
volume = 98,
place = {United States},
year = {Sat Dec 01 00:00:00 EST 2018},
month = {Sat Dec 01 00:00:00 EST 2018}
}
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Imitating intrinsic alignments: A bias to the CMB lensing-galaxy shape cross-correlation power spectrum induced by the large-scale structure bispectrum
text, January 2017
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Constraints on Cosmological Parameters from the Angular Power Spectrum of a Combined 2500 deg$^2$ SPT-SZ and Planck Gravitational Lensing Map
text, January 2017
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Mitigating Foreground Biases in CMB Lensing Reconstruction Using Cleaned Gradients
text, January 2018
- Madhavacheril, Mathew S.; Hill, J. Colin
- arXiv
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text, January 2002
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