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| Cosmology |
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| as a testing ground for
physics |
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| • | Extremely high energies and densities in early Big Bang |
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| test “Grand Unification Theories” which
combine rules |
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| for forces due to gravity, weak nuclear force, electric |
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| force, strong nuclear force |
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| • | Extremely large masses, distances, times, test |
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| General Theory of Relativity |
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