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Paper detail

CMB lensing power spectrum with next generation surveys

We introduce a new estimator of the CMB lensing power spectrum, together with its likelihood, based on iterative lensing reconstruction. Despite the increased complexity of the lensing maps, this estimator shares similarities with the standard quadratic estimator. Most importantly, it is unbiased towards the assumptions done on the noise and cosmology for the lensing reconstruction. This new spectrum estimator can double the constraints on the lensing amplitude compared to the quadratic estimator, while keeping numerical cost under control and being robust to errors.

preprint2022arXivOpen access
Louis LegrandJulien Carron
astro-ph.CO
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Louis LegrandJulien Carron

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