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Any of the various explanations of gravity as a quantum theory, including string theory and loop quantum gravity. NOT to be counfused with .

A requirement of quantum gravity springs from the fact that classical gravity and quantum matter cannot go along together, due to the Einstein Field Equation $G_{\mu\nu}=\frac{8\pi G}{c_0^4}T_{\mu\nu} $.

However, quantising gravity in the traditional way, leads to a non-renormalisable, divergent theory.

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