The idea of relative motion is an aspect of the theory of relativity (strictly, it’s Galilean relativity, rather than ...

Non-relativistic string theory offers an innovative perspective on the formulation of quantum gravity, providing a tractable limit of fully relativistic string theories by expanding in inverse powers ...

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(via Steve Mould) Thanks to Galilean relativity it should be just as hard to run on an inclined treadmill as it is to run on a hill of the same incline. But you don't gain gravitational potential ...