What is Bell's Inequality?

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[nbrown]

The video leaves one hanging with: “and Bells inequality ditinguishes between Einstein’s view of reality and the quantum view of reality”. He could have added: and the experiments showed that the quantum view of reality was right. One of the very rare occasions when Einstein was proven wrong.

[Tracks]

Keep it up! Looking forward for more videos from you, don't stop!

[vadrif-draco]

Good video although it doesn't actually address the question that is in the title... or like, it only says what Bell's Inequality is used for, rather than what it is (in-depth). Kinda expected for a video that's less than a minute and a half though.

[Another_Alexander]

Instructions unclear. Idk where I am but things keep poking me and speaking in a foreign language...they look different....I think they’re French...?

[BarryKort]

Bell's Inequality can be readily derived if you make the simplifying assumption that the presumptive hidden variable is static (not time varying).

But that's hardly a realistic assumption. So what happens if you allow the presumptive hidden variable to be time varying? You can still derive Bell's Inequality provided you make yet another simplifying assumption that the twin particles age in phase-locked synchrony. This amounts to assuming that the cosmos is regulated by a common master clock that keeps the same time everywhere and everywhen.

Is that a justifiable simplifying assumption? Hardly. Clocks are affected by gravity. In a cosmos (like ours) where gravitational gradients are pervasive, the twin particles do not age in perfect phase-locked synchrony. Once you admit that there is non-zero phase drift, the mathematics of Bell's derivation runs into a roadblock. The presumptive time-varying hidden variable does not vanish.

In short, the not-so-hidden variable is time itself.

Rather than complain about spooky action at a distance, Einstein should have mentioned the very real phenomenon of spooky timekeeping at a distance.

[sesshomarusma]

in fact it is the first time i hear about it