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Monday, September 8th 2014

12:15 pm:

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.

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