剪刀超光速切纸分析评述
Comment on Analysis of Scissors Cutting Paper at Super Luminal Speeds
摘要：
在最近的一篇论文中，人们证明了剪刀可以以超光速剪纸的流行传说确实是正确的。在这篇评论中，我们做了这个额外的观察，当剪切速度是超光速时，在惯性系中相对于剪刀的刀片静止的观察者所观察到的纸的剪切方向和在惯性系中相对于纸静止的观察者所观察到的纸的剪切方向是相反的。这是由于时间的同时性的相对性，以及在亚光速下无法到达的时空点在不同惯性系下所观察到的时间顺序是颠倒的。事实上，纸被剪在相反的方向观察到的纸和剪刀，可以是有趣的方面为学生的物理。
英文摘要：
In a recent paper, it was demonstrated that the popular legend that scissors can cut paper at super luminal speeds is indeed correct. In this comment we make this additional observation that when the cutting speed is super luminal, the direction of the cutting of the paper as observed by observers in the inertial frame stationary with respect to the blade of the scissors and the direction of the cutting of the paper as observed by observers in the inertial frame stationary with respect to the paper are opposite. This follows from the relativity of simultaneity, and the fact that space-time points that are separated beyond reach at sub-luminal speeds exhibit reversal in time order as observed by different inertial frames. The fact that the paper was cut in opposite directions as observed by the paper and scissors, can be interesting facet for students of Physics.
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