Astrophysical limits on Lorentz violation for all charged species

If Lorentz violation exists, it will affect the thresholds for pair creation processes. Lorentz-violating operators that change the maximum velocities of charged particles may increase or decrease the extinction rate of γ-rays moving through space. If the emissions from high-energy astrophysical sources do not show any signs of anomalous absorption, this allows us to place bounds on the Lorentz-violating c coefficients for multiple species of charged particles. The bounds for a species of mass mX based on observing photons at an energy Eγ can be O ( m X 2 / E γ 2 ) , which corresponds to limits at the 10 - 15 ( m X 2 / m e 2 ) level for the most energetic photons.