Weak gravitational lensing of the CMB

  title={Weak gravitational lensing of the CMB},
  author={A. Lewis and A. Challinor},
  journal={Physics Reports},
Weak gravitational lensing has several important effects on the cosmic microwave background (CMB): it changes the CMB power spectra, induces non-Gaussianities, and generates a B-mode polarization signal that is an important source of confusion for the signal from primordial gravitational waves. The lensing signal can also be used to help constrain cosmological parameters and lensing mass distributions. We review the origin and calculation of these effects. Topics include: lensing in General… Expand
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