15 May 2023
The spacetime of general relativity is based on a fundamental symmetry: the Lorentz symmetry, that can also be found in the standard model of particle physics. According to unification theories, a quantum theory of gravity would imply the breaking of the Lorentz and CPT (Charge, Parity, and Time) symmetries. Therefore, precise experiments/observations could in principle reveal deviations to general relativity as violations of Lorentz and CPT symmetries. In order to test this possibility, Bailey, Colladay, Kostelecký and Tasson [1-3] introduced a wide formalism called the standard model extension (SME). This formalism, by introducing some new coefficients, « the SME coefficients », allow to measure any deviations to Lorentz and CPT symmetries in all sectors of Physics. Our team is specialized in the analysis of astro-geodesic observations and laboratory-based experiments in the framework of the SME formalism.
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Bibliography
[3] D. Colladay and V. A. Kostelecký. CPT violation and the standard model. PRD 55, 67 60, 1997.