| Matter/Radiation
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| • | Cosmic
Microwave Background |
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| dominates the
radiation content! |
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| – | Comparing
radiation/matter mass density: |
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| – | This sets
dividing line between radiation and |
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| mass dominated
universes. Recall that for |
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| the standard
Friedman models R goes as t 2/3 |
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| rather than to
the ½ power. |
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