@preskill @AndrewDohertyQu @dabacon Wondering if any of you know the status of the question: can (classical or quantum) computers efficiently simulate general relativity?
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I'm not sure either. There are some strange spacetimes where there are two timelike paths from A to B where one path takes infinite proper time and the other finite. Naively that feels problematic, but analyzing resources necessary to create such spacetimes is beyond me.
Related: GR people seem to feel that some solutions are unphysical, and should be ruled out. But I don't have a good handle on which (or whether the community does either).
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In the opposite direction, I think maybe you could extend http://tuvalu.santafe.edu/~moore/gs-prl.pdf … to GR
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