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Cosmological solutions of the Einstein-Friedmann equations ...

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Cosmology<br />

Ω0 = 1<br />

is <strong>the</strong> critical density for which <strong>the</strong> universe just remains open, infinite and flat.<br />

Ω0 > 1<br />

<strong>the</strong> case <strong>of</strong> much matter, space closes due to gravitational attraction <strong>of</strong> mass.<br />

Gravity stops <strong>the</strong> expansion after finite time, <strong>the</strong> universe collapses, ends in heat<br />

death!<br />

c○ 2009, F. Jegerlehner ≪❘ Lect. 7 ❘≫ 471

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