辐射：由以光速运行的无质量或近无质量粒子所构成。
Radiation: composed of massless or nearly massless particles that move at the speed of light.
在近简并的封闭三能级V系统中，一束弱激光探测场的群速度可以通过控制一单色驱动场的强度实现慢光速到超光速的转换。
This paper reveals that the group velocity of a weak laser probe field can be manipulated by controlling the intensity of the driving field applied to a near-degenerate closed three-level V system.
其次，本文简述了近十几年来探索超光速粒子的实验，对某些肯定超光速粒子存在的实验作了评述，并指出所有这些实验均给出否定的结果。
It then reviews the vaious experiments of tachyons searching during mauy years up till now which gave the negative results, and explains some astronomical observations w…
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