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Voyager 1 Once Again Returning Science Data From All Four Instruments (hackaday.com)

submitted 5 months ago by FlyingSquid@lemmy.world to c/technology@lemmy.world

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[–] InnerScientist@lemmy.world 1 points 5 months ago (1 children)

And further down:

Unfortunately, if the one-way speed of light is anisotropic, the correct time dilation factor becomes ${\mathcal {T}}={\frac {1}{\gamma (1-\kappa v/c)}}$ , with the anisotropy parameter κ between -1 and +1.[17] This introduces a new linear term, $\lim \_{\beta \to 0}{\mathcal {T}}=1+\kappa \beta +O(\beta ^{2})$ (here $\beta =v/c$ ), meaning time dilation can no longer be ignored at small velocities, and slow clock-transport will fail to detect this anisotropy. Thus it is equivalent to Einstein synchronization.

[–] ricdeh@lemmy.world 1 points 5 months ago

Yes, I understand that part, but it doesn't disprove that such an experiment could show isotropy. Instead, it says that it would always indicate isotropy, which is not entirely useful either, of course. I'll dig deeper into the publication behind that section when I have the time. Nonetheless, my original point still stands. With a highly synchronised clock, you could measure the (an)isotropy of the one-way speed of light. To determine whether the time dilation issue is surmountable I'll have to look at the actual research behind it.