Position-space curved-sky anisotropy quadratic estimation
arXiv:1908.02016
The paper documents the publicly released Planck 2018 CMB lensing pipeline and presents analytic calculations for curved-sky, position-space quadratic estimators, including their responses, Gaussian noise biases, and optimal joint gradient‑curl estimators for arbitrary‑spin anisotropies.
Abstract
This document supplements the release of the Planck 2018 CMB lensing pipeline, now made publicly available. It collects calculations relevant to curved-sky separable quadratic estimators in the spin-weight, position-space correlation function formalism, including analytic calculations of estimator responses and Gaussian noise biases between arbitrary pairs of quadratic estimators. It also contains the derivation of optimal, joint gradient and curl mode quadratic estimators for parametrized anisotropy of arbitrary spin.
Planck 2018 CMB lensing pipeline available at https://github.com/carronj/plancklens