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Cosmological solutions of the Einstein-Friedmann equations ...

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Cosmology<br />

Actually, in <strong>the</strong> radiation dominated era <strong>the</strong> situation is qualitatively very similar to<br />

<strong>the</strong> matter dominated p = 0 scenario.<br />

Exercise: Express q(t) in terms <strong>of</strong> S and C (matter dominated) or ¯C (radiation<br />

dominated) scenario, respectively.<br />

For radiation in <strong>the</strong>rmal equilibrium (black body radiation) <strong>the</strong> Stefan-Boltzmann<br />

law holds:<br />

ρradiation = a T 4 c 2 ; a = π2 k 4 B<br />

15 3 c 2 = 8.418 × 10 −36 gr/cm 3 ◦ K −4<br />

c○ 2009, F. Jegerlehner ≪❘ Lect. 7 ❘≫ 462

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