月球Laser测距的c不变性检验
Lunar Laser Ranging Test of the Invariance of c
摘要：
从地球发射并由月球上的后向反射器返回的激光脉冲的速度是根据精确的往返飞行时间测量和建模距离计算出来的。在移动的观测者静止坐标系中测量的光速（c）被发现超过标准值c = 299，792，458 m/s 200+/-10 m/s，这正是观测站在测量过程中由于地球旋转而沿着视线的速度。这是对局部洛伦兹不变性的一阶破坏;光速似乎毕竟取决于观察者的运动，就像经典波动理论一样，这意味着光的传播存在一个优选的参考系。然而，目前的实验不能确定这样一个参考系可能与之联系的物理系统。
英文摘要：
The speed of laser light pulses launched from Earth and returned by a retro-reflector on the Moon was calculated from precision round-trip time-of-flight measurements and modeled distances. The measured speed of light (c) in the moving observers rest frame was found to exceed the canonical value c = 299,792,458 m/s by 200+/-10 m/s, just the speed of the observatory along the line-of-sight due to the rotation of the Earth during the measurements. This is a first-order violation of local Lorentz invariance; the speed of light seems to depend on the motion of the observer after all, as in classical wave theory, and implies that a preferred reference frame exists for the propagation of light. However, the present experiment cannot identify the physical system to which such a reference frame might be tied.
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