Description
Cosmic Microwave Background (CMB) is a powerful probe to study the early
universe and various cosmological models. Weak gravitational lensing affects the
CMB by changing its power spectrum, but meanwhile, it also carries information
about the distribution of lensing mass and hence, the large scale structure (LSS) of
the universe. When studies of the CMB is combined with the tracers of LSS, one
can constrain cosmological models, models of LSS development and astrophysical
parameters simultaneously. The main focus of this project is to study the cross-
correlations between CMB lensing and the galaxy matter density to constrain the
galaxy bias b and the amplitude scaling parameter A, to test the validity of ΛCDM
model. We test our approach for simulations of the Planck CMB convergence field
and galaxy density field, which mimics the density field of the Herschel-ATLAS (H-
Atlas) galaxy survey. We use maximum likelihood method to constrain the param-
eters.
