Searching for dark energy with the whole world's supernova dataset

The Supernova Cosmology Project's Union2 compilation and reanalysis of decades of supernova surveys from the world's leading researchers, with the addition of six high-redshift supernovae, puts new bounds on possible values for the nature of dark energy. Einstein's cosmological constant comfortably fits the data, but there's still plenty of room at the top for dynamical theories.

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