Effect of non-Gaussian lensing deflections on CMB lensing measurements

Böhm, Vanessa; Sherwin, Blake D.; Liu, Jia; Hill, J. Colin; Schmittfull, Marcel; Namikawa, Toshiya

doi:10.1103/PhysRevD.98.123510

Title: Effect of non-Gaussian lensing deflections on CMB lensing measurements

Journal Article · 30 November 2018 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.98.123510 · OSTI ID:1544147

Böhm, Vanessa ^[1]; Sherwin, Blake D. ^[2]; Liu, Jia ^[3]; Hill, J. Colin ^[4]; Schmittfull, Marcel ^[5]; Namikawa, Toshiya ^[6]

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)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1544147

Journal Information:: Physical Review D, Journal Name: Physical Review D Journal Issue: 12 Vol. 98; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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