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Astrophysics Colloquium

(G)astrophysics and Weak Gravitational Lensing
Presented by Michael Schneider
Lawrence Livermore National Laboratory

Thursday, September 26, 2013
4:00 P.M. in 169-336

Abstract
Weak gravitational lensing has become an important probe of cosmology that is, to first order, a direct probe of mass in the universe independent of astrophysical processes. However, for next generation dark energy surveys the systematic errors contributed by astrophysical sources of intrinsic galaxy shape alignments and clustering are important considerations. I will describe how we can use cosmological simulations effectively to build accurate models of astrophysical contaminants in weak gravitational lensing measurements; simultaneously improving the accuracy of cosmological parameter estimates and constraining models of galaxy formation. I will also demonstrate optimal estimators for lensing effects that may further alleviate the astrophysical modeling challenges for all-sky surveys such as LSST, Euclid, and WFIRST.

JPL Contact: Alina Kiessling (4-7391)


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