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OATS-DAUT SEMINAR
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Speaker: Jörg Dietrich (Physics Dept., Univ. of Michigan, USA)
Title: Weak Gravitational Lensing by Galaxy
Clusters and the Large Scale Structure
Date: Wednesday, November 10th, 2010
Time: 15:00
Venue: Villa Bazzoni
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Abstract:
Weak gravitational lensing, the distortion of faint background
galaxies by the tidal gravitational field of cosmic structures along
the line-of-sight, has emerged as one of the premier methods of
probing the dark matter distribution. In this talk I will discuss two
applications of weak lensing: (1) The prospects for a direct mapping
of large-scale structure filaments and the evidence we have for the
presence of a dark matter filament in the Abell 222/223 supercluster;
(2) A new method we recently developed to constrain cosmological
parameters with weak gravitational lensing, which makes use of present
day non-Gaussianity. This method, called the "shear-peak statistics",
is expected to give constraints that are competitive with current
cosmic shear methods, and even more powerful when combined with them.
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contact: Andrea Biviano (OATS)