Cosmological models discrimination with Weak Lensing

Understand

Weak gravitational lensing provides a unique method to map directly the dark matter in the Universe.

• The majority of lensing analyses uses the two-point statistics of the cosmic shear field to constrain the cosmological model yielding degeneracies, such as that between sigma_8 and Omega_M respectively the r.m.s.
• of the mass fluctuations at a scale of 8 Mpc/h and the matter density parameter both at z = 0.
• However, the two-point statistics only measure the Gaussian properties of the field and the weak lensing field is non-Gaussian.