TY - JOUR
T1 - CMB delensing beyond the B modes
AU - Green, Daniel
AU - Meyers, Joel
AU - Van Engelen, Alexander
N1 - Funding Information:
We thank Daniel Baumann, Raphael Flauger, Marcel Schmittfull, Neelima Sehgal, Blake Sherwin, and Kendrick Smith for helpful discussions. D.G. and J.M. also thank Daniel Baumann and Benjamin Wallisch for collaboration on related work that inspired this project. D.G. was supported by an NSERC Discovery Grant and the Canadian Institute for Advanced Research. J.M. was supported by the Vincent and Beatrice Tremaine Fellowship.
PY - 2017/12/4
Y1 - 2017/12/4
N2 - Gravitational lensing by large-scale structure significantly impacts observations of the cosmic microwave background (CMB): it smooths the acoustic peaks in temperature and E-mode polarization power spectra, correlating previously uncorrelated modes; and it converts E-mode polarization into B-mode polarization. The act of measuring and removing the effect of lensing from CMB maps, or delensing, has been well studied in the context of B modes, but little attention has been given to the delensing of the temperature and E modes. In this paper, we model the expected delensed T and E power spectra to all orders in the lensing potential, demonstrating the sharpening of the acoustic peaks and a significant reduction in lens-induced power spectrum covariances. We then perform cosmological forecasts, demonstrating that delensing will yield improved sensitivity to parameters with upcoming surveys. We highlight the breaking of the degeneracy between the effective number of neutrino species and primordial helium fraction as a concrete application. We also show that delensing increases cosmological information as long as the measured lensing reconstruction is included in the analysis. We conclude that with future data, delensing will be crucial not only for primordial B-mode science but for a range of other observables as well.
AB - Gravitational lensing by large-scale structure significantly impacts observations of the cosmic microwave background (CMB): it smooths the acoustic peaks in temperature and E-mode polarization power spectra, correlating previously uncorrelated modes; and it converts E-mode polarization into B-mode polarization. The act of measuring and removing the effect of lensing from CMB maps, or delensing, has been well studied in the context of B modes, but little attention has been given to the delensing of the temperature and E modes. In this paper, we model the expected delensed T and E power spectra to all orders in the lensing potential, demonstrating the sharpening of the acoustic peaks and a significant reduction in lens-induced power spectrum covariances. We then perform cosmological forecasts, demonstrating that delensing will yield improved sensitivity to parameters with upcoming surveys. We highlight the breaking of the degeneracy between the effective number of neutrino species and primordial helium fraction as a concrete application. We also show that delensing increases cosmological information as long as the measured lensing reconstruction is included in the analysis. We conclude that with future data, delensing will be crucial not only for primordial B-mode science but for a range of other observables as well.
KW - CMBR theory
KW - Cosmological parameters from CMBR
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U2 - 10.1088/1475-7516/2017/12/005
DO - 10.1088/1475-7516/2017/12/005
M3 - Article
AN - SCOPUS:85039868813
VL - 2017
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 12
M1 - 005
ER -