对“任意运动点电荷附近的坡印亭通量和辐射功率损失”评论的答复
Reply to comment on `Poynting flux in the neighbourhood of a point charge in arbitrary motion and the radiative power losses'
摘要：
在评论中表示怀疑（Eur. J. Phys.，39，018001，2018），关于我们最近发表的工作（Eur.《物理学杂志》，37，045210，2016）。我们对评论作出答复。特别指出，需要明确区分电磁辐射携带的能量-动量和辐射电荷引起的机械能-动量损失率。它还表明，虽然坡印廷通量总是积极的通过一个球形表面上的中心的延迟位置的电荷，它可以令人惊讶地通过一个表面上的中心的“目前”的位置的电荷是负的。它进一步表明，神秘的肖特项，迄今为止在文献中被认为是产生于一些加速度依赖的能量场，实际上是什么，但在延迟和现在的时间之间的电荷的自场的能量变化率的差异。
英文摘要：
Doubts have been expressed in a comment (Eur. J. Phys., 39, 018001, 2018), about the tenability of the formulation for radiative losses in our recent published work (Eur. J. Phys., 37, 045210, 2016). We provide our reply to the comment. In particular, it is pointed out that one need to clearly distinguish between the rate of the energy-momentum being carried by the electromagnetic radiation to far-off space, and that of the mechanical energy-momentum losses being incurred by the radiating charge. It is also demonstrated that while the Poynting flux is always positive through a spherical surface centred on the retarded position of the charge, it could surprisingly be negative through a surface centred on the "present" position of the charge. It is further shown that the mysterious Schott term, hitherto thought in literature to arise from some acceleration-dependent energy in fields, is actually nothing but the difference in rate of change of energy in self-fields of the charge between the retarded and present times.
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