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The Dark Energy Survey<br />
300,000,000 photometric redshifts<br />
• 4 complementary techniques:<br />
* Cluster counts & clustering<br />
* Weak lensing<br />
* Galaxy angular clustering<br />
* SNe Ia distances<br />
A new 3 deg 2 camera<br />
on the CTIO Blanco 4m<br />
Construction 2005-2009<br />
Survey 2009-2014 (~525 nights)<br />
5000 deg 2 g, r, i, z<br />
Goal: error bar of few % on W=P/ρ
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