关于运动方程时间不对称性的注记
Note on the Time Reversal Asymmetry of Equations of Motion
摘要：
Rohrlich最近声称点电荷的运动方程在时间反演下是对称的，这是一个不寻常的定义的结果。有限大小的带电球的运动方程，这与此相反，声称是不对称的，因为其（延迟）的自我力量的有限传播时间，被证明具有相同的不对称性（或相同的对称性，取决于定义）作为一个点电荷。类似的论点也适用于其他有效的运动方程（如描述摩擦或退相干的方程）。
英文摘要：
Rohrlich's recent claim that the equation of motion for a point charge be symmetric under time reversal is shown to be the result of an unusual definition. The equation of motion for a charged sphere of finite size, which in contrast is claimed to be asymmetric because of the finite propagation time of its (retarded) self-forces, is shown to possess the same asymmetry (or the same symmetry, depending on the definition) as that for a point charge. Similar arguments apply to other effective equations of motion (such as those describing friction or decoherence).
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