"Was ist Raum und Zeit? Darum geht es bei dem Problem der Quantengravitation. Mit der allgemeinen Relativitätstheorie gab Einstein uns nicht nur eine Theorie der Gravitation, sondern auch eine Theorie über das Wesen von Raum und Zeit, welche die vorausgegangene Konzeption Newtons erledigte. Die Schwierigkeit bei der Quantengravitation besteht darin, die aus der Relativitätstheorie gewonnenen Erkenntnisse über Raum und Zeit mit der Quantentheorie zu vereinbaren, die ebenfalls wesentliche, tiefgreifende Erklärungen über die Natur abgibt."
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Lee Smolin
US-amerikanischer Theoretischer Physiker
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