How to measure the one way speed of light.

[Q-reeus]

Aargh - I spent one hour on replying (basically it was all "no" + long explanations) but lost it all because I didn't make a backup and this site threw me out... too bad, won't have time anymore and should be sleeping now. If you still have any question one or two days from now, please ask again!

Amazing coincidence - precisely same thing happened to me (Microsoft automatic update = unwelcome reboot!) Ditto way overdue for sleep here too.

EDIT: In #55 "Another even simpler example, not very sensitive but 'for sure' in principle - a single match terminated line containing one or more sections of a very low Q almost '1/4 lambda' transmission cavity. Won't go into the details here, but not hard to show that any non-reciprocity in c and thus lambda will result in a corresponding reflection phase and amplitude variation." That was just outright wrong and is withdrawn unreservedly. Reflection always implies a two-way measurement!

 

[harrylin]

Yes it was listed early on in the thread, but I never got to read all of it myself. They claim clock synch is no barrier to making one-way tests, and quote Clifford Will to that effect. On the other hand these reviewers deny it can truly be done; ie. 'one-way' is always de facto 'two-way': http://math.ucr.edu/home/baez/physics/Relativity/SR/experiments.html#one-way_tests"

Both are somewhat correct: if a one-way experiment can break the PoR, then in principle a suitably designed two-way experiment should be capable of the same. However, different set-ups are more suited to test other aspects of the theory. In particular the repeat of the Marinov one-way experiment will be interesting.

 

[harrylin]

Amazing coincidence - precisely same thing happened to me (Microsoft automatic update = unwelcome reboot!) Ditto way overdue for sleep here too.

EDIT: In #55 "Another even simpler example, not very sensitive but 'for sure' in principle - a single match terminated line containing one or more sections of a very low Q almost '1/4 lambda' transmission cavity. Won't go into the details here, but not hard to show that any non-reciprocity in c and thus lambda will result in a corresponding reflection phase and amplitude variation." That was just outright wrong and is withdrawn unreservedly. Reflection always implies a two-way measurement!

OK. Just a short precision about my unclear explanation: with "nominal c-v" I meant that that measurement is merely a result of the observer's reference and synchronization -> you can transform it away to v=0 in which case you obtain isotropic light speed (see dictionary.com, "nominal" ).

Cheers,
Harald

 

[Q-reeus]

OK. Just a short precision about my unclear explanation: with "nominal c-v" I meant that that measurement is merely a result of the observer's reference and synchronization -> you can transform it away to v=0 in which case you obtain isotropic light speed (see dictionary.com, "nominal" ).
Cheers, Harald

Just knew it had to be something like that; glad we see eye to eye on that one! Meanwhile I've had an epiphany event of sorts.
ghwellsjr wrote in #56:
"The only difference between LET and SR is a philosophical one; LET claims that nature operates on a single unidentifiable absolute ether rest frame in which we are almost always moving with respect to, while SR claims that every inertial observer can consider himself to be at rest in, what amounts to, the absolute ether rest frame. There can be no test that can distinguish between the two."
Yep, now agree.
harrylin wrote in #62:
"Both are somewhat correct: if a one-way experiment can break the PoR, then in principle a suitably designed two-way experiment should be capable of the same. However, different set-ups are more suited to test other aspects of the theory. In particular the repeat of the Marinov one-way experiment will be interesting."
Yes and yes and yes.

Focusing on means to measure a notional one-way c, hadn't stop to think what a non-null result would fully imply. In the proposed twin fiber arrangement of #53, if null balancing was foregone, as the interference pattern shifted with orientation, the coupling probe will act as a variable scatterer/reflector - changing the overall energy flow and thus the physics. Consequently we can draw the conclusion a finite one-way c effect is automatically incompatible with the basic postulate of SR/LET - physical equivalence of all inertial reference frames. Way too much observational support for that to be in question, at anything above Planck scale physics anyway. So another 180 degree turn and it's back full circle. No point in hunting for a non-event. I'm exhausted - catch you all much later!