![]() ![]() ![]() For such signals, it can be proven that the earliest time at which that switching event can be observed is limited exactly by propagation with the vacuum velocity. Therefore, a different kind of signal must be considered, where no information at all is sent out before a certain moment of time. For example, a Gaussian-shaped pulse can be detected long before its peak due to the rise of intensity at earlier times. However, the error lies in identifying the peak of the pulse with the temporal position of the carried information. Group velocities larger than then appear to lead to superluminal transmission and can occur e.g. The information then appears to propagate with the group velocity, i.e.
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