The benefits of CMB delensing

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 varie...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2022-04, Vol.2022 (4), p.20
Main Authors: Hotinli, Selim C., Meyers, Joel, Trendafilova, Cynthia, Green, Daniel, van Engelen, Alexander
Format: Article
Language:English
Subjects:
ASTRONOMY AND ASTROPHYSICS
CMBR polarisation
cosmological parameters from CMBR
Gravitational effects
Gravitational lenses
Gravitational waves
gravitational waves and CMBR polarization
Iterative methods
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
weak gravitational lensing
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Summary: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 B -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 feedback effects on the lensing power spectrum are mitigated by delensing. All of these benefits are possible without any changes to experimental or survey design. We develop a self-consistent, iterative, all-orders treatment of CMB delensing on the curved sky and demonstrate the impact that delensing will have with future surveys.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2022/04/020