Slide 1

CMB, lensing, and non-GaussianitiesAntony Lewishttp://cosmologist.info/

Lewis arXiv:1107.5431Hanson & Lewis arXiv:0908.0963Lewis, Challinor & Hanson arXiv:1101.2234Pearson, Lewis & Regan arXiv:1201.1010Howlett, Lewis, Challinor & Hall arXiv:1201.3654+ (mostly) work by other peopleMoriond March 2012

Hu & White, Sci. Am., 290 44 (2004)Evolution of the universeOpaqueTransparentCMB temperature

End of inflationLast scattering surfacegravity+pressure+diffusion

14 000 Mpcz~1000z=0

Observed CMB temperature power spectrum

ObservationsConstrain theory of early universe+ evolution parameters and geometryWMAP 7

Keisler et al, arXiv:1105.3182Larson et al, arXiv:1001.46355e.g. Geometry: curvatureflatclosed

We see:

or is it just closer??flat

We see:

Degeneracies between parametersflat

Samples in 6D parameterspace(e.g. using MCMC, adaptive importance sampling, etc.CosmoMC, PMC, MultiNest).

WMAP 7

Constrain some combinations of parameters accuratelyUse other information to break remaining degeneracies, and provide complementary informationPlanck forecast

Howlett, Lewis, Challinor & Hall arXiv:1201.3654Beyond the power spectrumGaussian + statistical isotropy: Flat sky approximation:BispectrumTrispectrum

N-spectraNon-Gaussianity general possibilities

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