cianfa72's latest activity
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cianfa72 replied to the thread High School Why is the constant speed of light so unique?.I believe the key point in the last bullet is (all) inertial frame. This is defined such that light propagation (coordinate) speed is... -
cianfa72 reacted to A.T.'s post in the thread High School Why is the constant speed of light so unique? with
Like.
I find this comparison confusing: - For sound you talk about "moving relative to the wave". (Whatever that means) - For light you talk... -
cianfa72 replied to the thread Undergrad Synchronizing clocks in an inertial frame if light is anisotropic.I was thinking about this again. The synchronization procedure/convention described above assigns the same coordinate time "label" to...
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cianfa72 reacted to Peter Morgan's post in the thread Graduate Alternative model for counterfactual definiteness in Bohm-like EPR with Like.
It's Gregor Weihs's experiment from the mid-1990s, demonstrating a violation of a Bell-CHSH inequality, which is closely related to...
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cianfa72 replied to the thread Graduate Alternative model for counterfactual definiteness in Bohm-like EPR.Sorry, not sure to understand your apparatus/setup. Is it a Bohm-type EPR kind of experiment ? From a correlation perspective, it seems...
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cianfa72 posted the thread Graduate Alternative model for counterfactual definiteness in Bohm-like EPR in Quantum Interpretations and Foundations.As far as I know, in the context of Bohm-type EPR experiment, Bell's inequalities are logical consequences of the following assumptions...
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This is easy to address. Photon counting arguments are risky because not all states preserve photon number. A better approach is to...
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cianfa72 reacted to Ibix's post in the thread High School Why is the constant speed of light so unique? with Like.
As A.T. says, the speed of sound is constant with respect to the medium. In air it's about ##330\mathrm{ms^{-1}}##, but if you are...
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cianfa72 reacted to A.T.'s post in the thread Undergrad Question about Parallel Transport with Like.
"Extrema" is a generalization of "minima" and "maxima" only, and doesn't include "saddles" which are "stationary" but not "extremal"...
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cianfa72 replied to the thread Undergrad Question about Parallel Transport.Ah ok, so you (mistakenly) thought you had found a (counter) example consisting of a geodesic of ##E^4## which is not a geodesic of the...
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cianfa72 reacted to A.T.'s post in the thread Undergrad Question about Parallel Transport with
Agree.
'Extremal' doesn't include saddles, like the longer part of a great circle. The safe statement for an arbitrary long geodesic is that... -
cianfa72 replied to the thread Undergrad Do existing EFE solutions support Closed Timelike Curves?.Ok, therefore, according the today standard physics, there is no way to take a CTC journey or reach some (remote) region of spacetime...
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cianfa72 replied to the thread Undergrad Do existing EFE solutions support Closed Timelike Curves?.Do physicists think that Gödel or Kerr-Gödel-type solutions could be plausible models for our Universe ?
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cianfa72 replied to the thread Undergrad Question about Parallel Transport.Ok, this is actually an example of the other way around. Namely geodesics of that 3-sphere's contained surface fail to be a geodesics of...
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cianfa72 replied to the thread Undergrad Do existing EFE solutions support Closed Timelike Curves?.Well, then, for instance in Gödel's universe, by following a suitable timelike path, one could came back to the event where the journey...