Internal delensing of Planck CMB temperature and polarization

Carron, Julien; Lewis, Antony; Challinor, Anthony

doi:10.1088/1475-7516/2017/05/035

Title: Internal delensing of Planck CMB temperature and polarization

Journal Article · Wed May 17 00:00:00 EDT 2017 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2017/05/035· OSTI ID:1543932

Carron, Julien ^[1]; Lewis, Antony ^[2]; Challinor, Anthony ^[3]

Univ. of Sussex, Brighton (United Kingdom)
Kavli Inst. for Cosmology, Cambridge (United Kingdom)
Kavli Inst. for Cosmology, Cambridge (United Kingdom); Univ. of Cambridge (United Kingdom)

We present a first internal delensing of CMB maps, both in temperature and polarization, using the public foreground-cleaned (SMICA) Planck 2015 maps. After forming quadratic estimates of the lensing potential, we use the corresponding displacement field to undo the lensing on the same data. We build differences of the delensed spectra to the original data spectra specifically to look for delensing signatures. After taking into account reconstruction noise biases in the delensed spectra, we find an expected sharpening of the power spectrum acoustic peaks with a delensing efficiency of 29 % (TT) 25 % (TE) and 22 % (EE). The detection significance of the delensing effects is very high in all spectra: 12 σ in EE polarization; 18 σ in TE; and 20 σ in TT. The null hypothesis of no lensing in the maps is rejected at 26 σ. While direct detection of the power in lensing B-modes themselves is not possible at high significance at Planck noise levels, we do detect (at 4.5 σ {under the null hypothesis}) delensing effects in the B-mode map, with 7 % reduction in lensing power. Our results provide a first demonstration of polarization delensing, and generally of internal CMB delensing, and stand in agreement with the baseline ΛCDM Planck 2015 cosmology expectations.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1543932

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2017, Issue 05; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 50 works

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