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Physics
Special and General Relativity
Why do we know space-time is locally flat?
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[QUOTE="PeterDonis, post: 5533442, member: 197831"] Because doing so gives us a theory, General Relativity, that matches the results of experiments to very high accuracy. The EP says so, yes, but that's not why we know it's true, because it just shifts the question to, why do we know that the EP is true? The answer to that is the same answer I gave above. No one has ever observed any signs of spacetime itself being quantized. According to most physicists, this is to be expected since if spacetime is quantized, the length scale on which we would expect to see such effects is roughly the Planck length, which is 20 orders of magnitude smaller than the smallest length scale we can probe experimentally (roughly the size of an atomic nucleus). [/QUOTE]
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Special and General Relativity
Why do we know space-time is locally flat?
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