The benefits of CMB delensing

Hotinli, Selim C.; Meyers, Joel; Trendafilova, Cynthia; Green, Daniel; van Engelen, Alexander

doi:10.1088/1475-7516/2022/04/020

The benefits of CMB delensing

Journal Article · Tue Apr 12 00:00:00 EDT 2022 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2022/04/020· OSTI ID:1903362

Hotinli, Selim C. ^[1]; Meyers, Joel ^[2]; Trendafilova, Cynthia ^[2]; Green, Daniel ^[3]; van Engelen, Alexander ^[4]

Johns Hopkins Univ., Baltimore, MD (United States); Southern Methodist University
Southern Methodist Univ., Dallas, TX (United States)
Univ. of California, San Diego, CA (United States)
Arizona State Univ., Tempe, AZ (United States)

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. Here, 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.

View Accepted Manuscript (DOE)

Research Organization:: Southern Methodist Univ., Dallas, TX (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0009919; SC0010129; SC0019035

OSTI ID:: 1903362

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 04 Vol. 2022; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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