The reconstructed CMB lensing bispectrum

被引：3

作者：

Kalaja, Alba ^{[1
,2
]}

Orlando, Giorgio ^{[1
]}

Bowkis, Aleksandr ^{[3
,4
]}

Challinor, Anthony ^{[3
,4
,5
]}

Meerburg, P. Daniel ^{[1
]}

Namikawa, Toshiya ^{[6
]}

机构：

[1] Univ Groningen, Van Swinderen Inst Particle Phys & Grav, Nijenborgh 4, NL-9747 AG Groningen, Netherlands

[2] Flatiron Inst, Ctr Computat Astrophys, 162 5th Ave, New York, NY 10010 USA

[3] Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[4] Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England

[5] Ctr Math Sci, DAMTP, Wilberforce Rd, Cambridge CB3 0WA, England

[6] Univ Tokyo, Kavli Inst Phys & Math Universe WPI, UTIAS, Kashiwa, Chiba 2778583, Japan

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2023年 / 04期

关键词：

gravitational lensing; non-gaussianity; weak gravitational lensing;

D O I：

10.1088/1475-7516/2023/04/041

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Weak gravitational lensing by the intervening large-scale structure (LSS) of the Universe is the leading non-linear effect on the anisotropies of the cosmic microwave background (CMB). The integrated line-of-sight mass that causes the distortion - known as lensing convergence - can be reconstructed from the lensed temperature and polarization anisotropies via estimators quadratic in the CMB modes, and its power spectrum has been measured from multiple CMB experiments. Sourced by the non-linear evolution of structure, the bispectrum of the lensing convergence provides additional information on late-time cosmological evolution complementary to the power spectrum. However, when trying to estimate the summary statistics of the reconstructed lensing convergence, a number of noise -biases are introduced, as previous studies have shown for the power spectrum. Here, we explore for the first time the noise-biases in measuring the bispectrum of the reconstructed lensing convergence. We compute the leading noise-biases in the flat-sky limit and compare our analytical results against simulations, finding excellent agreement. Our results are critical for future attempts to reconstruct the lensing convergence bispectrum with real CMB data.

引用

页数：42

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