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CMB lensing correlations impact cosmology

Published on:

22 August 2023

Primary Category:

Cosmology and Nongalactic Astrophysics

Paper Authors:

Cynthia Trendafilova


Key Details

Lensing changes CMB statistics, enabling lensing potential reconstruction

Lensing introduces correlations between CMB and lensing potential

For ΛCDM, impact of neglecting correlations is small (<3%)

For extensions sensitive to lensing, impact can be >10% of error bars

AI generated summary

CMB lensing correlations impact cosmology

Gravitational lensing of the cosmic microwave background (CMB) allows reconstruction of the lensing potential. This can help constrain cosmological parameters, but lensing introduces correlations between the CMB and reconstructed lensing potential. This work quantifies the impact of neglecting these correlations on cosmological parameter constraints. For 6-parameter ΛCDM, the effect is small, shifting constraints <3%. But for extensions with parameters sensitive to lensing, like neutrino mass, curvature, and dark energy equation of state, the impact can be >10% of error bars.

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