小议超光速

About the Super-light Speed

电磁波的相速度与群速度都用于描述电磁波的传播,但二者又是基于不同的角度。本文从电磁波的相速度与群速度入手,对一些有关超光速的实验与现象案例进行列举和分类,并阐述了其与因果律的关系,进而从相对论世界线的角度对超光速运动进行了描述。最后对超光速及实验做了展望。

Both the phase velocity and the group velocity of electromagnetic waves are used to describe the propagation of electromagnetic waves, but the two are based on different angles. This article starts with the phase velocity and group velocity of electromagnetic waves, enumerates and classifies some experiments and phenomena cases related to superluminal velocity,and expounds its relationship with causality law, and then describes superluminal motion from the perspective of the relativistic world line. Finally, the prospects for superluminal speed and experiment are presented.