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It’s not gravity which distorts Space-Time. The bending or distortion of space-time is due to the mass. If there is more mass, more will be the distortion. Einstein’s Theory says Gravity is not a force. But a manifestation of Spacetime curve. If Space-time is flat, means so-called Euclidean and that geometry is called Minkowski. There is no Gravity, no mass at all. or if there is a mass the mass is so small, like an atomic scale. In atomic scale the Space-Time is flat. There is no effect of gravity on that scale. What we best do is neglect the potential due to gravity, because it’s magnitude is so small than any other interactive force like Electromagnetic, Nuclear interaction. By using the Space-time idea, people have construed Relativistic QM. But due to so much mathematical inconsistency, this theory is no longer valid.  People have evaluated more advance theory like  QFT  (Quantum field theory), Which is consistent with Einstein’s special theory of relativity. Scientist u