Analogue models for $\mathrm{CP}$ violation in neutral-meson systems are studied in a general framework. No-go results are obtained for models in classical mechanics that are nondissipative or that involve one-dimensional oscillators. A complete emulation is shown to be possible for a two-dimensional oscillator with rheonomic constraints, and an explicit example with spontaneous T and $\mathrm{CPT}$ violation is presented. The results have implications for analogue models with electrical circuits.

• Received 29 December 2000

DOI:https://doi.org/10.1103/PhysRevD.63.096002