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A Direct Measure of Cosmic Acceleration

Published onMay 31, 2019
A Direct Measure of Cosmic Acceleration


Two decades after the discovery of accelerating cosmic expansion, there remains no direct detection of a change in the expansion velocity versus time. Redshift drift directly determines H(z), thus it is arguably the cleanest measurement of expansion history. Dedicated experiments can detect redshift drift with a five-year observational baseline.

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