Bimetric theory refers to a class of modified mathematical theories of gravity (or gravitation) in which two metric tensors are used instead of one. Often the second metric is introduced at high energies, with the implication that the speed of light may be energy-dependent. There are several different bimetric theories, such as those attributed to Nathan Rosen (1909–1995) or Mordehai Milgrom with Modified Newtonian Dynamics (MOND).
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