- #1
Saw
Gold Member
- 631
- 18
In the page about Experimental Basis of SR, there is this comment, preceding the references to experiments on the one-way speed of light:
I am not sure I understand the message. When the author says several times (especially in the last sentence) "these theories", is he always referring to "aether theories"? If the answer is yes, does it mean that all the experiments mentioned below are consistent with aether theories and that is why the experiments in question are "unable to rule out" aether theories?
In other words, is it correct to say that, actually, SR only requires the 2-way speed of light to be isotropic?
Note that while these experiments clearly use a one-way light path and find isotropy, they are inherently unable to rule out a large class of theories in which the one-way speed of light is anisotropic. These theories share the property that the round-trip speed of light is isotropic in any inertial frame, but the one-way speed is isotropic only in an æther frame. In all of these theories the effects of slow clock transport exactly offset the effects of the anisotropic one-way speed of light (in any inertial frame), and all are experimentally indistinguishable from SR. All of these theories predict null results for these experiments.
I am not sure I understand the message. When the author says several times (especially in the last sentence) "these theories", is he always referring to "aether theories"? If the answer is yes, does it mean that all the experiments mentioned below are consistent with aether theories and that is why the experiments in question are "unable to rule out" aether theories?
In other words, is it correct to say that, actually, SR only requires the 2-way speed of light to be isotropic?