Tests of Spacetime Symmetry with Particle Traps
  Lorentz and CPT symmetry have been tested at high precision in numerous experiments. A general theoretical framework incorporating possible Lorentz and CPT violation in an extension of the standard model of particle physics has been developed. In this framework, analyses of several precision experiments have been performed to find unsuppressed symmetry-violating signals. This paper discusses features of the theory, presents results for trapped-particle systems, and reports bounds from recent experiments. 
Neil Russell