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Formulating Weak Lensing From Boltzmann Equation

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If you have a question about this talk, please contact Camille Bonvin.

The CMB weak lensing is a nonlinear effect and contributes significantly to CMB power spectra, bispectra and trispectra. An accurate calculation of the lensing effect is crucial for studying the late-time evolution of the universe and eliminating contaminations from the primordial signals of inflation. Currently, the lensing effect is calculated by the remapping approach which can be derived through the geodesic equations. In this talk, I will demonstrate a novel and systematic approach to formulate the lensing effect through the Boltzmann equation in arbitrarily high order. This approach identifies explicitly the approximations implied in the remapping approach and helps to assess the approximations. Moreover, I will apply the formalism to study the lens-lens couplings on the temperature power spectrum.

This talk is part of the Cosmology Lunch series.

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