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We’re excited to finally be able to show the supernova cosmology results from the completed Dark Energy Survey. We observed for 6 years with a custom-built camera on the CTIO-4m telescope in Chile, and followed-up with spectra from the Anglo-Australian Telescope. This produced a brand new sample of ~1500 type Ia supernova, which approximately quintuples the cosmology-quality high-redshift (z > 0.5) supernovae in the literature. We find tight constraints on dark energy and dark matter and see tantalising hints that the equation of state of dark energy may change with time. This amazing data also allowed us to detect gravitational lensing magnification of the supernovae (which gives information on the shape of dark matter haloes) and make a beautifully precise measurement of time dilation due to the expansion of the Universe. |
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