Université de GenèveDépartement de Physique ThéoriqueCAP Genève

Improved CMB (de-)lensing using general spherical harmonic transforms

21. April 2023
Cite as: 
M. Reinecke, S. Belkner, J. Carron, arxiv.org:2304.10431
Members involved: 

We propose a novel way of performing CMB lensing and adjoint lensing by using non-uniform-discrete-Fourier-transforms and find many orders increase in accuracy, at least one order of magnitude faster computation time, and strongly reduced memory consumption with this new approach. With this, CMB lensing analyses on a typical stage-4 like experiment can be done within a few seconds. We provide a fully tested Python package, lenspyx\url{https://github.com/carronj/lenspyx} for the CMB lensing related tasks, and the low level implementations of the C++ core-functions DUCC \url{https://pypi.org/project/ducc0/} which comes with a handy Python wrapper.


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