So, the equations for general relativity are as follows: G (mu, nu) = ĸ T (mu,nu)$$G (mu, nu) = ĸ T (mu,nu)$$ I was told, that since energy, momentum and other observables are quantum then the stress-energy tensor-is $T$ is quantum., and therefore the Einstein tensor $G$ must be adapted to it. However, what if we used expected values $\langle T\rangle$ to make the stress-energy tensor "classical" which makes quantum gravity "unnecessary". How would this lead to any problems, and why haven't we tried it.?
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duplicates list edited from What are the reasons to expect that gravity should be quantized?, Is the quantization of gravity necessary for a quantum theory of gravity? to What are the reasons to expect that gravity should be quantized?, Why does gravity need to be quantised?, Is the quantization of gravity necessary for a quantum theory of gravity?
Qmechanic ♦
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