Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Design of Experiments for Light Speed Invariance to Moving Observers

Version 1 : Received: 22 February 2021 / Approved: 24 February 2021 / Online: 24 February 2021 (11:41:54 CET)

How to cite: Chen, Q. Design of Experiments for Light Speed Invariance to Moving Observers. Preprints 2021, 2021020547. Chen, Q. Design of Experiments for Light Speed Invariance to Moving Observers. Preprints 2021, 2021020547.


The principle of the constancy of the velocity of light, which stated that the light velocity is invariant to the motion of the emitter, was well established and directly proven by experiments. Interestingly, the further assumption that the light velocity is independent of the motion of the observer was, arguably, never directly proven by any experiment for a century. This paper proposed the design of two experiments to directly test this assumption, which tried to address some perceived technical difficulty in such experiments. One is to directly measure the light speed as to moving sensors. The experiment setup is designed in such a way that the concerns of time synchronization and dilation can be avoided. Another experiment is to test the isotropy of the light speed to a moving particle in the electromagnetic accelerator by measuring the momentum to acceleration ratio. The experiment result, if positive, will provide direct and solid proof of the assumption. Otherwise, it may imply a need for further investigation. Since the light speed invariance to moving observers is a key assumption of some fundamental physical theory, either way, the experiments will have significant meanings.


Design of experiments, Light velocity, observers, Special Relativity, Time dilation, Time synchronization, Sagnac effect, Mass-Energy relationship, Particle acceleration, Michelson-Morley experiment, Asymmetry Theory


Physical Sciences, Acoustics

Comments (1)

Comment 1
Received: 24 February 2021
Commenter's Conflict of Interests: I am the author
Comment: If anyone know any direct experiment proving the light speed invariance to moving observers, the author appreciate if you can share. Direct means not by inference or argument. For example, someone talked about M-M experiment, which only proved the variance is much less than earth speed.
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