Conference on Applied Inverse Problems, July 20-24, 2009, Vienna, Austria
Poster Presentation
Sarah Bridle: The GREAT08 and GREAT09 Challenges - an inverse probelm in cosmology

Mon, 20 July, 2009, 17:15-18:15, Foyer

The GRavitational lEnsing Accuracy Testing 2008 (GREAT08)
Challenge focuses on a problem that is of crucial importance for fu-
ture observations in cosmology. The shapes of distant galaxies can
be used to determine the properties of dark energy and the nature
of gravity, because light from those galaxies is bent by gravity from
the intervening dark matter. The observed galaxy images appear dis-
torted, although only slightly, and their shapes must be precisely
disentangled from the effects of pixelisation, convolution and noise.
The worldwide gravitational lensing community has made significant
progress in techniques to measure these distortions via the Shear
TEsting Program (STEP). Via STEP, we have run challenges within
our own community, and come to recognise that this particular image
analysis problem is ideally matched to experts in statistical inference,
inverse problems and computational learning. Thus, in order to continue
the progress seen in recent years, we are seeking an infusion of new ideas
from these communities. The GREAT08 Challenge deadline is 30th April 2009,
and we are currently preparing a follow-up containing a more difficult
simulation set: the GREAT09 Challenge.

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