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Cosmological solutions of the Einstein-Friedmann equations ...

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Cosmology<br />

in which case, independent <strong>of</strong> k!<br />

such that<br />

S (t) 4 ¯C 1/4<br />

is universal.<br />

(ct) 1/2 ; ¯C = κ<br />

3 ρ0,rad S 4 0 i.e.<br />

ρtot(t) 3<br />

4 κ (ct) 2<br />

S 4 0<br />

S 4 (t) =<br />

Now, in <strong>the</strong> radiation dominated early phase after <strong>the</strong> Big Bang<br />

3<br />

4 κ (ct) 2 ρ0,rad<br />

˙S 2<br />

c 2 = κ<br />

3 ρ S 2 − k = ¯C<br />

S 2 − k ; ¯C κ<br />

3 ρ S 4 = constant<br />

shows that <strong>the</strong> curvature term proportional to k is subleading and may be dropped<br />

c○ 2009, F. Jegerlehner ≪❘ Lect. 7 ❘≫ 475<br />

,

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