I Explaining Sagnac vs. SRT Violation & Reconciling Lorentz Transform

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The discussion centers on the apparent conflict between the Sagnac effect observed in ring laser and fiber-optic gyroscopes and the principles of Special Relativity Theory (SRT). Participants clarify that the Sagnac effect does not violate SRT, as it can be explained within the framework of relativity when considering non-inertial frames, such as those used in GPS systems. The need for Sagnac corrections in GPS is highlighted, emphasizing that the speed of light remains constant in inertial frames, while the gyroscopes measure rotation, which is non-inertial. The conversation also touches on the historical context of experiments related to SRT, with participants seeking examples of observations that led to the development of relativity rather than those that merely confirm it. Overall, the Sagnac effect is framed as a valid phenomenon that aligns with SRT when properly understood.
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Your formula for SR is given in leading order of the ##v/c## expansion. You have to apply the same approximation also for the aether-theory result
$$\Delta t=\frac{2L v}{c^2} \frac{1}{1-v^2/(n^2 c^2)}=\frac{2L v}{c^2} (1+\mathcal{O}(v^2/c^2)),$$
i.e., you get the same leading-order result in SR an Aether theory.
 
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