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| Looking back in time : |
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| density of radiation, rad 4T4/c3 |
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| number of photons conserved , but due to |
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| cosmological redshift they lose energy by (1+z) |
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| rad (1 + z)4 |
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| density of matter m (1 + z)3 |
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| Trad 2.75 x (1 + z) |
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| at present, matter dominates |
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| mass-energy
of universe. |
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| Earlier, radiation dominated |
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