Supernova cosmology with the complete Dark Energy Survey
Speaker: Professor Tamara Davis
Affiliation: University of Queensland
Abstract
We’re excited to finally be able to show the supernova cosmology results from the completed Dark Energy Survey (DES) — a project involving hundreds of researchers around the world, which for me started here at UQ twelve years ago. With 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. Within months this result was supported by similar results from large scale structure by the Dark Energy Spectroscopic Instrument (DESI). We’ve also used these amazing data sets to make the first strong detection of supernova magnification due to gravitational lensing, test gravitational models that go beyond general relativity, make a precise measurement of time dilation due to the expansion of the Universe, and put limits on the mass of neutrinos. Many of these efforts were led by early career researchers here at UQ, so I’ll especially celebrate their results in this talk.
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Venue
Room: 222