速度研究的科学意义

The Scientific Meaning of Researches on Velocity

科学技术的发展史其实就是不断改进和提高速度的历史,因为更高速度表示可以用更少时间克服更大距离。本文突出了在航天时代加快航天器速度的迫切需要。指出近年来多国科学家进行的超光速研究极大地促进了对速度问题的探索。波动是物质运动的独特表现形式,目前对波速度要有新认识。波速研究是波科学探索的一个重点和突破口。本文认为超前波存在,而负波速是超光速的一种特殊形态。我们对波科学中的群速公式作重新推导和阐述,证明2000年的WKD负群速实验并非“在计算上有错误”,指出这个问题也关系到对超前波和因果性的理解。

The history of science and technology is actually a history of continuous improvement and increase in speed,because higher speed means that it can overcome a larger distance in less time.In this paper,we focus the urgent requirement of the speed improvement of spacecraft for aerospace age.In recent years,the study on faster-than-light by scientists from many countries has greatly promoted the exploration of the velocity problem.Wave is a unique form of material movement.Now,we need have the new understanding of the wave speed.The study of wave velocity is a key point and break through in the exploration of wave science.Actually,the advanced waves are present in nature,and the negative wave velocity is a special form of superluminal speed.In this article,the group velocity formula is re-proved and discussed.It is proved that the WKD negative group velocity experiment in 2000 was not“error in calculation”,and pointed out that this problem is also related to the understanding of advanced waves and the causality.