ISBN: | 978-5-5147-6170-8 |
High Quality Content by WIKIPEDIA articles! Standard-Model Extension (SME) is an effective field theory that contains the Standard Model, General Relativity, and all possible operators that break Lorentz symmetry. Violations of this fundamental symmetry can be studied within this general framework. CPT violation implies the breaking of Lorentz symmetry, and the SME includes operators that both break and preserve CPT symmetry.