Next ACϟJC: Monday, May 29th, 2023 at 4 pm

This time we'll have a special seminar from Louis Legrand (ICTP-SAIFR).

• Title: CMB lensing power spectrum for next generation experiments

• Abstract: In this talk I will introduce a new CMB lensing power spectrum estimator for deep polarization surveys. Thanks to the B modes of polarization produced by gravitational lensing, upcoming surveys will optimally reconstruct the lensing field by iteratively delensing the polarization maps. I will show that despite the increased complexity of the reconstructed lensing map, its power spectrum shares similarities to the state-of-the-art quadratic estimator. I will demonstrate that this new spectrum estimator and its likelihood are robust to modeling biases and to sources of anisotropies such as the noise and the mask of the survey. This iterative estimators can improve the constraints on a combination of cosmological parameters of interest, including the neutrino mass, by 40%.

Logistics:

Date: Monday 05/29 at 4 pm.

Location: IFT 3rd floor, room 3.

Remote connection: zoom link (password: jccosmo)