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How does the concordance model tell 73% and 27% apart?

April 26, 2017apart concordance model

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How does the concordance model tell 73% and 27% apart?

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These are the proportions that explain the different observations. Dark matter measurements point to a matter density of 25-30%, but don’t say very much about dark energy. This is the vertical orange-pink region on the concordance model plot on p. 29 of today’s lecture.