http://en.wikipedia.org/wiki/Birkhof...8relativity%29
Zitat:
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Another interesting consequence of Birkhoff's theorem is that for a spherically symmetric thin shell, the interior solution must be given by the Minkowski metric; in other words, the gravitational field must vanish inside a spherically symmetric shell. This agrees with what happens in Newtonian gravitation.
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Wird damit auch "pulsierende" Hohlkugel mit eingeschlossen?