Nicolas Martinet (ENS Cachan) 

Title: Cosmological constraints from shear peaks in weak lensing maps

Abstract: Weak lensing (WL) theory has become a major tool in studying
cosmology, leading to the development of large surveys such as LSST,
Euclid and WFIRST. The study of peaks in WL maps is a recent technique
that presents the advantage of adding constraints on cosmological
parameters using the same data as needed for cosmic shear. After
briefly reviewing WL theory, I will focus on the detection of peaks in
WL map simulations. Then, I will review the latest results on the
subject and present our method adapted to work on actually observed
shear, rather than convergence, maps. Finally, I will describe how to
extend the method to peak tomography and our study of the potential
gains it offers for constraining cosmological parameters, using the
new SUNGLASS WL simulation pipeline.