You do get neat effects like cerenkov radiation ( that lovely nuclear reactor glow ) , but you ' re not violating causality or any of the other features of the light - speed limit because they ' re tied to the vacuum speed c 类似于契伦科夫辐射(核反应堆所发出的漂亮蓝光就由其产生)的奇妙效应确实存在,但你仍未打破光速的限制,因为所有这些速度最终都不能超过真空中的光速c 。