Massive neutrinos suppress the growth of structure below their free-streaming scale and

In this talk, I will discuss the forward model approach to reconstruct cosmological fields in a Bayesian framework with focus on two examples - neutral hydrogen intensity mapping and galaxy clustering. 

The cosmology analyzes of the Year-3 (Y3) data from the Dark Energy Survey (DES) is at full speed ahead. Our preliminary weak lensing sample contains 120 million objects over 4200 square degrees of sky and is the largest shape catalog to date. This statistical power comes at a price: the cosmic shear measurements are more sensitive not only to the signal but also to potential systematics.

The field of CMB lensing is somewhere akin to where measurements of the primary CMB itself were 15 years ago; we have detected it's there and measured some scales to moderate significance, but the exciting era of deep precision measurements is just on the horizon. Over the coming decade, CMB lensing (the distortion of the CMB photons by gravitational lensing due to the matter along the CMB photon's paths) will precisely probe the distribution of matter in the universe out to high red shifts.