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 857 GHz 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 , with an amplitude of relative to the expected value of unity. This first demonstration on data of CIB delensing, and of delensing techniques in general, is significant because lensing removal will soon be essential for achieving high-precision constraints on inflationary -mode polarization.
- Received 20 July 2016
DOI:https://doi.org/10.1103/PhysRevLett.117.151102
© 2016 American Physical Society
Physics Subject Headings (PhySH)
Synopsis
Undoing the Effects of Gravitational Lensing
Published 5 October 2016
Researchers demonstrate a method for removing gravitational lensing effects that distort maps of the cosmic microwave background.
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