University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Monday, September 8th 2014
12:15 pm:
Speaker: Tim Eifler, JPL
Subject: Constraining Cosmology and Dark Energy Models with the Dark Energy Survey

The Dark Energy Survey (DES) has recently started its second season of
Observations; so far it covers ~1800 square degrees (23.5 mag i-band).
This high quality data set will be extended to 5000 square degrees (24 mag i-band) over the next 4 years and it poses new challenges for the precise
modeling of observables of the Universe's Large-Scale Structure (LSS),
and its astrophysical and observational systematics.

The tightest constraints on cosmology from DES data will be obtained from
a joint analysis of all probes (e.g., weak lensing, galaxy clustering, and
magnification) that can be extracted from the DES data set. Such joint
analyses face several difficulties: First, the cosmological information is
highly correlated, which requires a joint likelihood including all cross
correlations between the individual probes. Second, even more problematic
are the correlations of various systematic effects originating from
astrophysics and the measurements themselves.

In this talk I will give an introduction to the DES collaboration and
ongoing and future DES projects. I will describe the CosmoLike code
framework that we have developed for a joint likelihood analysis of
multiple cosmological probes extracted from DES data. This multi-probe DES
analysis is an excellent starting point to prepare for challenges of
future cosmological data sets from LSST, Euclid, and WFIRST.

The weekly calendar is also available via subscription to the physics-announce mailing list, and by RSS feed.