摘要
在Newton理论中引力速度是无限大,而在Einstein理论中引力速度是光速。广义相对论(GR)认为引力与电磁力不同,是弯曲时空的纯几何效应。但现在应思索某些不同的引力模型,例如把引力重新当作平直时空中的自然界的力的传播,从而又研究得出引力速度大于2×1010c(c是真空中光速)。虽然超光速的力传播违反Einstein的狭义相对论(SR),却符合Lorentz的相对性理论(LR)。……对宇航界的推进器动力学科学家而言引力是很重要的;近年来太空科学呼吁实验物理学家研究比光速更快传播的信号源。引力以超光速传播的可能将激励科学家们作进一步实验与探索。
The speed of gravity in Newton＇ s universal law is infinite, but the gravity propagation speed in Einstein＇ s theory is the speed of light. General relativity （GR） explains these features by suggesting that gravitation （unlike electromagnetic forces） is a pure geometric effect of curved space-time, not a force of nature that propagates. Moreover, now different gravity models need to be considered. For example, if gravity is once again taken to be a propagating force of nature in flat spacetime with the propagation speed indicated by observational evidence and experiments： not less than 2 ×10^10c（c is the speed of light in vacuum）. Although faster-than-light force, propagation speeds do violate Einstein＇s Special relativity （SR）, they are in accord with Lorentzian relativity （LR）.
Gravity plays a crucial role at these speeds and this should be a concern to the propulsion dynamicist. Recently, space-technology calls for experimental physicists to find new signal sources, which can propagate with speed greater than that of light. The possibility that gravity may propagate faster-than-light encourages scientists to conduct new experiments and studies.
出处
《中国传媒大学学报（自然科学版）》
2007年第3期1-12,共12页
Journal of Communication University of China：Science and Technology
关键词
引力速度
超光速
相对论
speed of gravity
faster-than-light
relativity
