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7. Gravitational Theory: Introduction
Pages 59-60

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From page 59...
... Further stimulation came from the fruitful interaction of particle physics and quantum gravity in the development of field-theory techniques that could be applied to both areas and the progress in particle physics toward energy scales where quantum gravity must be important. Fundamental discoveries within the field (the singularity theorems and the Hawking radiation to give just two 59
From page 60...
... Even the universe itself is a highly relativistic system in that recession velocities approach the speed of light for the most distant known objects. The General Theory of Relativity, as a fundamental theory of physical interactions, contains three major kinds of purely gravitational elementary objects: gravitational waves, black holes, and isolated universes.


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