We revisit quantum-classical hybrid systems of the Sudarshan type under the light of Galilean covariance. We show that these kind of hybrids cannot be given as a unitary representation of the Galilei group and at the same time conserve the total linear momentum unless the interaction term only depends on the relative canonical velocities …

中文翻译：

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Sudarshan型量子经典混合系统的Galilean协方差

根据伽利略协方差，我们重新审视了Sudarshan类型的量子经典混合系统。我们证明，这类混合体不能以伽利略组的统一表示形式给出，并且同时保留总线性动量，除非相互作用项仅取决于相对标准速度……