TL;DR
CMB delensing improves the precision of cosmological measurements, enhances the detection of primordial gravitational waves, and simplifies data analysis by reversing lensing effects without requiring changes in survey design.
Contribution
We develop a comprehensive, iterative all-orders method for CMB delensing on the curved sky and demonstrate its benefits for future surveys.
Findings
Sharper acoustic peaks and damping tails in delensed spectra.
Reduced B-mode power enhances gravitational wave searches.
Lower covariance improves constraints on non-Gaussianities.
Abstract
The effects of gravitational lensing of the cosmic microwave background (CMB) have been measured at high significance with existing data and will be measured even more precisely in future surveys. Reversing the effects of lensing on the observed CMB temperature and polarization maps provides a variety of benefits. Delensed CMB spectra have sharper acoustic peaks and more prominent damping tails, allowing for improved inferences of cosmological parameters that impact those features. Delensing reduces -mode power, aiding the search for primordial gravitational waves and allowing for lower variance reconstruction of lensing and other sources of secondary CMB anisotropies. Lensing-induced power spectrum covariances are reduced by delensing, simplifying analyses and improving constraints on primordial non-Gaussianities. Biases that result from incorrectly modeling nonlinear and baryonic…
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