Lower Bound on the Propagation Speed of Gravity from Gravitational Cherenkov Radiation

Details Lower Bound on the Propagation Speed of Gravity from Gravitational Cherenkov Radiation Lower Bound on the Propagation Speed of Gravity from Gravitational Cherenkov Radiation

2001-06-19

arxiv.org/abs/hep-ph/0106220v2

JHEP 0109:023,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages with 1 figure, JHEP style. References added, slight (superficial) changes

Scientific paper

10.1088/1126-6708/2001/09/023

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 $c_g \neq c$. We show that the case $c_g < c$ 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 $c-c_g < 2 \times 10^{-15} c$; if the cosmic rays have an extragalactic origin the bound is orders of magnitude tighter, of order $c-c_g < 2 \times 10^{-19} c$.

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