狭义相对论与超光速运动

近来年,王力军等利用增益线性反常色散,证明了激光脉冲在铯原子气中的超光速传递;激光脉冲在此区域以超过光速c甚至负的群速传递,而脉冲的外形无改变.以往课本上说,没有任何东西,包括光本身的传递能快于光.新的实验表明它不再正确.研究表明,如果人们相信超光速运动可能存在,那么按照爱恩斯坦的方法,利用芬斯勒时空ds4=gijkldxidxjdxkdxl取代通常的闵柯夫斯基时空,我们可以得到新的时空变换.基于新变换的讨论不仅可保留Einstein狭义相对论的全部内容而且包容超光速运动.

Special Relativity and Superluminal

Recently, L. J. Wang, A. Kuzmich and A. Dogariu use gain-assisted linear anomalous dispersion to demonstrate superluminal light propagation in atomic caesium gas. The group velocity of a laser pulse in this region exceeds c and can even become negative, while the shape of the pulse is preserved. The textbooks say nothing can travel faster than light, not even light itself. New experiments show that this is no longer true. This paper shows that if one thinks of the possibility of the existence of the superluminal-speeds (the speeds faster than that of light) and re-describe the special theory of relativity following Einstein's way, it could be supposed that the physical spacetime is a Finsler spacetime, characterized by the metric ds4 =gijkldxidxkdxl If so, a new spacetime transformation could be found by invariant ds4 and the theory of relativity is discussed on this transformation.