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[ascl:2307.051] WeakLensingQML: Quadratic Maximum Likelihood estimator applied to Weak Lensing

WeakLensingQML implements the Quadratic Maximum Likelihood (QML) estimator and applies it to simulated cosmic shear data and compares the results to a Pseudo-Cl implementation. The package computes and saves relevant data files for later processes, such as the fiduciary cosmic shear power spectrum used in the analysis, the sky mask, and computing an analytic version of the QML's covariance matrix. The core of the package implements a conjugate-gradient approach for the quadratic estimator, and is parallelized for maximum performance. The code relies on the Eigen linear algebra package and the HealPix spherical harmonic transform library. A post-processing script analyzes the results and compares the QML's estimates with those from the Pseudo-Cl estimator; it then produces an array of plots highlighting the results.

Code site:
https://github.com/AlexMaraio/WeakLensingQML
Described in:
https://ui.adsabs.harvard.edu/abs/2023MNRAS.520.4836M
Bibcode:
2023ascl.soft07051M

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ascl:2307.051
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