How to squeeze information out of a weak lensing survey and how to get it wrong

04.05.2018 14:15 – 15:15

The weak gravitational lensing signal generated by the cosmic large-scale structure contains information about the initial
conditions of structure formation, the dynamics of the cosmological fluids and the theory of gravity. Because it is “only” based
on relativity, the physics behind gravitational lensing is conceptually simple (but technically difficult :)). I’d like to show in
my talk how the weak lensing signal can be used to constrain models of gravity and will extensively discuss systematic effects
like intrinsic shape correlations of galaxies, which have a major impact on cosmological inference. Specifically, I’ll give an
introduction to the two major alignment models for spiral and elliptical galaxies based on tidal gravitational interaction, and
discuss possible ways of disentangling them from the weak lensing signal.

Lieu

Bâtiment: Ecole de Physique

Auditoire Stueckelberg

entrée libre