Demonstration of cosmic microwave background delensing using the cosmic infrared background
Patricia Larsen, Anthony Challinor, Blake D. Sherwin, Daisy Mak

TL;DR
This paper demonstrates the first successful delensing of Planck CMB temperature maps using the cosmic infrared background, significantly sharpening acoustic peaks and paving the way for improved primordial B-mode polarization measurements.
Contribution
It presents the first practical application of CIB-based delensing on Planck data, reducing lensing effects and confirming theoretical expectations.
Findings
Lensing effects in the temperature power spectrum are reduced as expected.
The acoustic peaks are sharpened with a significance of 16σ.
The delensing amplitude is measured as 1.12 ± 0.07.
Abstract
Delensing is an increasingly important technique to reverse the gravitational lensing of the cosmic microwave background (CMB) and thus reveal primordial signals the lensing may obscure. We present a first demonstration of delensing on Planck temperature maps using the cosmic infrared background (CIB). Reversing the lensing deflections in Planck CMB temperature maps using a linear combination of the 545 and 857GHz maps as a lensing tracer, we find that the lensing effects in the temperature power spectrum are reduced in a manner consistent with theoretical expectations. In particular, the characteristic sharpening of the acoustic peaks of the temperature power spectrum resulting from successful delensing is detected at a significance of 16, with an amplitude of relative to the expected value of unity. This first demonstration on data of CIB…
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