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An overview of recent progress on searches for Lorentz- and CPT-violatingsignals with confined particles and antiparticles in Penning traps ispresented. In the context of the Standard-Model Extension (SME), leading-ordershifts in the cyclotron and anomaly frequencies of a confined particle andantiparticle due to Lorentz and CPT violation are provided. The two frequenciesare then related to comparisons of charge-to-mass ratios and magnetic momentsbetween particles and antiparticles. Applying reported results fromPenning-trap experiments leads to new limits on various coefficients forLorentz violation.

Searches for Lorentz and CPT Violation with Confined Particles