%0 Journal Article %T Theory and Tests of CPT and Lorentz Violation %A Alan Kostelecky %J Physics %D 1999 %I arXiv %X A general Lorentz-violating extension of the standard model of particle physics, allowing for both CPT-even and CPT-odd effects, is described. Some of its theoretical aspects and experimental implications are summarized. %U http://arxiv.org/abs/hep-ph/9904467v1