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• W2065722241 abstract "We studied the accuracy, robustness, and self-consistency of pixel-domain simulations of the gravitational lensing effect on the primordial cosmic microwave background (CMB) anisotropies due to the large-scale structure of the Universe. In particular, we investigated the dependence of the precision of the results precision on some crucial parameters of these techniques and propose a semi-analytic framework to determine their values so that the required precision is a priori assured and the numerical workload simultaneously optimized. Our focus was on the B-mode signal, but we also discuss other CMB observables, such as the total intensity, T, and E-mode polarization, emphasizing differences and similarities between all these cases. Our semi-analytic considerations are backed up by extensive numerical results. Those are obtained using a code, nicknamed lenS2HAT – for lensing using scalable spherical harmonic transforms (S2HAT) – which we have developed in the course of this work. The code implements a version of the previously described pixel-domain approach and permits performing the simulations at very high resolutions and data volumes, thanks to its efficient parallelization provided by the S2HAT library – a parallel library for calculating of the spherical harmonic transforms. The code is made publicly available." @default.
• W2065722241 created "2016-06-24" @default.
• W2065722241 creator A5014339868 @default.
• W2065722241 creator A5086473944 @default.
• W2065722241 date "2013-08-01" @default.
• W2065722241 modified "2023-09-30" @default.
• W2065722241 title "High-precision simulations of the weak lensing effect on cosmic microwave background polarization" @default.
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• W2065722241 doi "https://doi.org/10.1051/0004-6361/201321575" @default.
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