If such a theory could be constructed, it would have particles to manifest excited states, called gravitons. But for a BH, gravitons generated by its mass couldn't escape, so they couldn't function as force carrying particles as in other quantum field theories. We'd still need Einstein's GR to account for the gravitational "force" via curvature of space-time. So what would a quantum theory of gravity buy us? Why do we need it? AG
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