Fast computation of angular power spectra and covariances of high-resolution cosmic microwave background maps using the Toeplitz approximation

@article{Louis2020FastCO,
  title={Fast computation of angular power spectra and covariances of high-resolution cosmic microwave background maps using the Toeplitz approximation},
  author={Thibaut Louis and Sigurd Naess and X. Garrido and Anthony Challinor},
  journal={Physical Review D},
  year={2020}
}
We present a simple approximation that can speed up the computation of the mode-coupling matrices, which are usually the bottleneck for computing unbiased angular power spectra, as well as their associated covariance matrices, of the cosmic microwave background temperature and polarization anisotropies. The approximation results in the speed up of the MASTER algorithm by more than an order of magnitude with very little loss of precision. We demonstrate the performance on simulations of… 

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