Gravitational Lensing

Curvature fluctuations generated by large scale structure in the universe lens the CMB photons. Gravitational lensing smears out sharp features in the spectrum of primary anisotropies. The amount of lensing is highly dependent on the model. In the popular scale invariant adiabatic model it is unlikely to make features such as the acoustic peaks unobservable (see Seljak 1996b, especially this figure).

Intro. | Sound | Baryons | Doppler | Driving | Damping | Project. | ISW | Spectrum | Sensit. | Reion.