Forecasts show that CMB and galaxy lensing bispectra improve parameter constraints over power spectra alone for stage-4 surveys, with strong synergy between the two probes especially on neutrino mass when using weak priors.
CMB lensing beyond the power spectrum: Cosmological constraints from the one-point probability distribution function and peak counts
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Future Parameter Constraints from Weak Lensing CMB and Galaxy Lensing Power- and Bispectra
Forecasts show that CMB and galaxy lensing bispectra improve parameter constraints over power spectra alone for stage-4 surveys, with strong synergy between the two probes especially on neutrino mass when using weak priors.