Speaker
Description
In the era of high precision Cosmic Microwave Background (CMB) anisotropy measurements, detection of the primordial graviational waves (PGW) will be one of the main goals of the upcoming CMB experiments. To make it possible precise cleaning of the CMB maps from diffused contamination coming from polarised galactic emission and CMB gravitational lensing effect is needed. We investigate the impact of residual galactic foregrounds in lensing reconstruction and delensing for CMB-S4 like experiment providing a complete pipeline for such experiment. This impact can be also important for the constraint on the $\sigma_8$ parameter estimated using the lensing potential. In this work, we pay special attention to forecast constraints for the amplitude of the primordial gravitational waves and their senstivity to different foreground models with varying complexity. As we will show, non-Gaussian galactic foregrounds are seen to have significant impact on the gravitational wave amplitude constraints. Accurate modelling of the foregorunds will be crucial for unbiased estimation of the amplitude.
