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## Main Question or Discussion Point

I have read several times that general relativity has some problems with quantum mechanics and they are not compatible. However, special relativity can be introduced in quantum mechanics mainly by Dirac equations (so I am pretty sure that the problem of passing from a frame where the parameter is time to one where the parameter is the proper time τ, and spacetime is 4 dimensional should not be a problem. I have had two degree subjects in quantum mechanics and one in general relativity. In this last one it was stated that in order to change from special relativity to general relativity no curvature terms should be added, but we should change the partial derivatives, by covariant derivatives (using Christoffel symbols).

So, taking all into account, does anyone know any mathematically expressed explanation of where is this problem? (It sounds to me something about renormalization, but I cannot say)

Thanks in advance

So, taking all into account, does anyone know any mathematically expressed explanation of where is this problem? (It sounds to me something about renormalization, but I cannot say)

Thanks in advance