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Cosmological solutions of the Einstein-Friedmann equations ...

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Cosmology<br />

in terms <strong>of</strong> <strong>the</strong> observables H(t) and q(t). Fur<strong>the</strong>rmore, we have<br />

Also, with<br />

˙S 2<br />

C<br />

=<br />

c2 S<br />

C = 2 c<br />

H(t)<br />

− k ,<br />

q(t)<br />

; q(t) ≥ 0 !<br />

3/2<br />

(|2 q(t) − 1|)<br />

¨S C<br />

= −<br />

c2 2S 2 ; q = − ¨S S 1<br />

=<br />

˙S 2 2<br />

C<br />

C − kS<br />

c○ 2009, F. Jegerlehner ≪❘ Lect. 7 ❘≫ 454

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