group p velocity群速度
anomalous group-velocity异常群速度
group dispersion velocity群速度色散
group-velocity index群速度指数
controllable group-velocity群速可控
group sinking velocity群体沉速
group-velocity reduction群速变慢
group settling velocity群体沉速
normal group-velocity正常群速度
Compared with the case that the defect is non-dispersive, the dispersion of the defect layer leads to an ultraslow group velocity.
与包含无色散缺陷的光子晶体相比，缺陷的色散可导致极慢的群速度。
Theexperimental result reveals that the obvious contrast between the characteristic ofsuperluminal group velocity propagation speed and that of electricity or light in normalpropagation exists.
实验结果揭示了群速超光速传输速度特点与光和电的正常传输情况有明显的区别。
参考来源 - 关于频率信号异常传播速度的研究Light with the group velocity faster than the one in a vacuum is defined as fast light.
快光是指在某体系中光的群速度比其在真空中的传播速度要快。
参考来源 - 人工复合材料中的快光及慢光传播N（名词） the speed at which energy is propagated in a wave. This is the quantity determined when one measures the distance which the radiation travels in a given time. In a medium in which the speed increases with wavelength the group speed is less than the phase speed, and vice versa 群速 [physics]