Bounds on Spin-Dependent Lorentz Violation From Inverse Compton   Observations
  Some of the best bounds on possible Lorentz violation in the electron sector come from observations of high-energy astrophysical phenomena. Using measurements of TeV inverse Compton radiation from a number of sources, we place the first bounds--at the 10^(-15) level--on seven of the electron d coefficients. 
Brett Altschul