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CMB lensing and delensing with low-noise polarization data

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If you have a question about this talk, please contact Dr Dong-Gang Wang.

For CMB polarization noise well below the lensing $B$-power, methods more powerful but more complex than quadratic estimators must be used in order to achieve best recovery of the CMB lensing signal. This is particularly relevant for example for deep (CMB-S4 like) experiments aimed at constraining the primordial gravitational wave background from inflation, or for tightest constraints on neutrino masses and other parameters from the lensing spectrum. I will discuss the maximum a posteriori reconstruction method we have been developing in Geneva, and its applications to ‘somewhat realistic’ CMB -S4 delensing and r-constraints, as well as the estimation of the lensing power spectrum in this regime. At CMB -S4 depth the lensing post-Born curl mode becomes a signal, and I’ll discuss its optimal internal joint reconstruction with the lensing gradient.

This talk is part of the Cosmology Lunch series.

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