Lower bound on the propagation speed of gravity from gravitational Cherenkov radiation

  title={Lower bound on the propagation speed of gravity from gravitational Cherenkov radiation},
  author={Guy D. Moore and Ann E. Nelson},
  journal={Journal of High Energy Physics},
Recently, interesting 4-D Lorentz violating models have been proposed, in which all particles have a common maximum velocity c, but gravity propagates (in the preferred frame) with a different maximum velocity cg≠c. We show that the case cg < c is very tightly constrained by the observation of the highest energy cosmic rays. Assuming a galactic origin for the cosmic rays gives a conservative bound of c−cg <2 × 10−15c; if the cosmic rays have an extragalactic origin the bound is orders of… Expand

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