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  1. Originally Answered: Why can’t we quantize gravity ?
    What would you expect a quantum theory of gravity to do? Normal quantum theories allow prediction of energy states in bound systems that prevent them from collapsing. That would possibly affect ideas of black holes. They also predict scattering angles and products. To include “gravitons” might help understand the big bang’s inception.

    The reason most attempts at quantizing gravity have failed is something called renormalization. One must add up all the possible things that could happen when particles encounter each other. This sometimes results in an infinite answer, but for other kinds of fields it can be renormalized to give a finite and correct result. However, when all the ways space and time might vary are taken into account, the result is not so far renormalizable. It might be possible to argue over whether this is necessary, but the conventional approach requires it.

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