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"[@Nittany Discord":](/1018546#comment_7547462
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GR is differential geometry and tensor calculus. Its issues is quantization / being renormalized after being quantized. It doesn't like that.


 
But I've read about perturbation theory being used in GR, so I know it's possible - but maybe it's jonly ustable on a parsoluticularon is what yolu're referring to (ie, not generally)? - that, and it doesn't account for back-reaction so it's more deeply flawed in that sense as an approximation.

"@Nittany Discord":/1018546#comment_7547462
GR is differential geometry and tensor calculus. Its issues is quantization / being renormalized after being quantized. It doesn't like that.

But I've read about perturbation theory being used in GR, so I know it's possible - but maybe it's just on a particular solution - that, and it doesn't account for back-reaction so it's more deeply flawed in that sense as an approximation.