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Our basic premise is that minuscule apparent violations of spacetime symmetries might be observable in nature. The idea is that the violations would arise as suppressed effects from a more fundamental theory.

The best existing description of nature at its fundamental level is a combination of Einstein's theory of gravity, General Relativity, with the Standard Model of particle physics. This description assumes exact spacetime symmetries, including the global Lorentz and CPT invariance of the Standard Model, and the local Lorentz and diffeomorphism invariance of General Relativity.

Our publications construct a general framework (the Standard-Model Extension or SME) for describing arbitrary violations of all these spacetime symmetries. We also study the potential origin of the violations in underlying unified theories and the implications for experiments.

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