超光速传播电磁场和引力场的近场分析

W. Walker
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引用次数: 0

摘要

基于麦克斯韦方程组的近场分析表明,电偶极子和磁偶极子或四极子产生的场以及四极子质量源产生的引力波在源的近场以超光速传播,在远场以光速传播。在这些系统的近场中,相速度和群速度都是超光速的。虽然在这些系统的近场显示出信息速度与群速度不同,但在信号噪声较小且调制方法已知的情况下,可以在远小于波传播时间的时间周期内提取信息,从而使信息速度仅略低于超光速群速度。它表明,相对论表明,这些超光速信号可以被一个移动的帧反射,导致信息在信号被传输之前到达(即时间上的倒退)。目前尚不清楚这些信号是否可以用来改变过去。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Near-Field Analysis of Superluminally Propagating Electromagnetic and Gravitational Fields
A near-field analysis based on Maxwells equations is presented which indicates that the fields generated by both an electric and a magnetic dipole or quadrapole, and also the gravitational waves generated by a quadrapole mass source propagate superluminally in the nearfield of the source and reduce to the speed of light as the waves propagate into the farfield. Both the phase speed and the group speed are shown to be superluminal in the nearfield of these systems. Although the information speed is shown to differ from group speed in the nearfield of these systems, provided the noise of the signal is small and the modulation method is known, the information can be extracted in a time period much smaller than the wave propagation time, thereby making the information speed only slightly less than the superluminal group speed. It is shown that relativity theory indicates that these superluminal signals can be reflected off of a moving frame causing the information to arrive before the signal was transmitted (i.e. backward in time). It is unknown if these signals can be used to change the past.
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