The Dark Energy Survey Supernova Program: slow supernovae show cosmological time dilation out to z 1.
We present a precise measurement of cosmological time dilation using the light curves of 1504 Type Ia supernovae from the Dark Energy Survey spanning a redshift range $0.1\lesssim z\lesssim 1.2$. We find that the width of supernova light curves is proportional to $(1+z)$, as expected for time dilation due to the expansion of the Universe. Assuming
White, R. M. T. et al.
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2024