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quantum gravity |
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String theory is simply the only hope we currently have for a quantum theory of gravity, and obviously gravity has to be quantized to be consistent with the rest of what we know about physics. Hawking side-steps the issue: if space-time is a self-contained continuum without boundaries, as the quantum theory of gravity implies, it is meaningless to talk about what happened at or before its origin (which would be a boundary). This could be a key to understanding the forces of nature, including the quantum theory of gravity. |
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