MOND is the idea that Gravity either behaves differently at extremely large scales or that our understanding of acceleration must be modified for extremely low acceleration rates. Some versions of MOND propose that at extremely large scales Gravity does not follow an inverse square law but instead follows something more like an inverse law, while others propose that at extremely low accelerations our equations for acceleration break down and need to be modified.
How would Modified Gravity influence the rest of physics? How would MOND affect Gravitational Waves for instance? If the equations involving acceleration were modified for low acceleration rates would this influence the equations involving momentum?