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Delensing CMB Polarization with External Datasets

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arxiv 1010.0048 v2 pith:PIGICJKS submitted 2010-10-01 astro-ph.CO

Kendrick M. Smith , Duncan Hanson , Marilena LoVerde , Christopher M. Hirata , Oliver Zahn This is my paper · ORCID
classification astro-ph.CO
keywords delensingpolarizationlensingmapsb-modeeitherforecastshigh-resolution
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One of the primary scientific targets of current and future CMB polarization experiments is the search for a stochastic background of gravity waves in the early universe. As instrumental sensitivity improves, the limiting factor will eventually be B-mode power generated by gravitational lensing, which can be removed through use of so-called delensing algorithms. We forecast prospects for delensing using lensing maps which are obtained externally to CMB polarization: either from large-scale structure observations, or from high-resolution maps of CMB temperature. We conclude that the forecasts in either case are not encouraging, and that significantly delensing large-scale CMB polarization requires high-resolution polarization maps with sufficient sensitivity to measure the lensing B-mode. We also present a simple formalism for including delensing in CMB forecasts which is computationally fast and agrees well with Monte Carlos.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. CMB Lensing Trispectrum as a Probe of Parity Violation in LSS

    astro-ph.CO 2025-05 conditional novelty 6.0 of 10

    The CMB lensing trispectrum is sensitive to parity violation in large-scale structure, and a parity-odd toy model predicts a detectable signal in idealized noiseless forecasts.

  2. Delensing Degree-Scale $B$-Mode Polarization with High-Redshift Line Intensity Mapping

    astro-ph.CO 2019-08 conditional novelty 6.0 of 10

    High-redshift line intensity mapping could add about 11 percent to CMB-S4 delensing performance, but only if line-of-sight density modes survive foreground removal.

  3. Detecting rotation from lensing in the CMB

    astro-ph.CO 2025-01 accept novelty 5.0 of 10

    If lensing field rotation also rotates CMB polarization, SPT-3G plus galaxy-survey templates should detect the effect at SNR~7, and CMB-S4 deep could detect it internally at 3.9σ.

  4. Stage IV CMB forecasts for warm inflation

    astro-ph.CO 2024-12 conditional novelty 5.0 of 10

    Future CMB surveys are forecast to tighten the dissipation parameter of quartic warm inflation by up to an order of magnitude and to exclude the cubic dissipation model under a null tensor-to-scalar ratio.

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