Séminaire Univers / 
« CMBlensing by nonlinear (and nonGaussian) structures » 
Björn Schäffer 
Weak lensing of the cosmic microwave background is a source of cosmological information from the redshift range z=35 which is difficult to probe by other means. The statistical detection of the statistical homogeneitybreaking by Planck in excess of 40 sigma has allowed the determination of cosmological parameters on the percentlevel. In the interpretation of the signal one usually assumes Gaussian statistics of the deflecting largescale structure, which is only approximately true due to nonGaussianity generation in nonlinear structure formation. I show a few results that we obtained in relaxing the assumption on Gaussianity, both using analytical and numerical methods, and conceptual results concerning the CMBlensing formalism.

jeudi 30 juin 2016  14:00 Salle 281 Institut d'Astrophysique de Paris 
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