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Mudassir Ali
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Originally Answered: Why would gravity have quantum properties?
Because the universe is inherently quantum. The definitions of time and space are incompatible between gravity and quantum mechanics. Our theory of gravity only works because we apply it at scales where the incompatibilities are negligible, and don’t affect the results.
To properly model a situation where both gravity and quantum mechanics have significant effects, you’ll need to harmonize the definitions of space and time. That will inherently be quantum-mechanical; there is no way to account for quantum mechanical effects with classical space-time.
Most likely, the resulting theory won’t really be identical to quantum mechanical space-time but will instead be yet another thing. That “other thing” is going to have to have a lot of the properties that we think of as quantum mechanical, so it’s easiest to say that gravity will have quantum properties.