Bell's theorem & "spooky action at a distance"

Discussion in 'Physics & Math' started by RainbowSingularity, Feb 15, 2019.

  1. RainbowSingularity Valued Senior Member

    Messages:
    7,447
    whats the core principal ?

    i got brain fade after reading several pages of technical language on some other stuff.
    (my dopamine levels and hormones are a bit back to front at the mo)

    why you may ask...
    i am curious if there is something about how bell developed his theory from Einsteins work, to see if there is the potential for the next step on the subject to gain some momentum.

    any help or discussion greatly appreciated
    or just jump in and say hi.

    please discuss any thoughts you have on the subject, post any links you have stumbled over linking to any new fringe theory's about where im pondering etc.

    thoughts welcome, trolls not welcome

    https://en.wikiquote.org/wiki/Bell's_theorem

    https://en.wikiquote.org/wiki/Principle_of_locality
     
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  3. iceaura Valued Senior Member

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    30,994
    My go-to explanation for a lay inquiry:
    https://faraday.physics.utoronto.ca/PVB/Harrison/BellsTheorem/BellsTheorem.html
    {{ In the last section we made two assumptions to derive Bell's inequality which here become:
    -Logic is valid.
    -Electrons have spin in a given direction even if we do not measure it.
    Now we have added a third assumption in order to beat the Uncertainty Principle:
    -No information can travel faster than the speed of light.
    We will state these a little more succinctly as:
    1. Logic is valid.
    2. There is a reality separate from its observation
    3. Locality.
    You will recall the we discussed proofs by negation. The fact that our final form of Bell's inequality is experimentally violated indicates that at least one of the three assumptions we have made have been shown to be wrong.

    You will also recall that earlier we pointed out that the theorem and its experimental tests have nothing to do with Quantum Mechanics. However, the fact that Quantum Mechanics correctly predicts the correlations that are experimentally observed indicates that the theory too violates at least one of the three assumptions.

    Finally, as we stated, Bell's original proof was in terms of hidden variable theories. His assumptions were:
    1. Logic is valid.
    2. Hidden variables exist.
    3. Hidden variables are local.
    Most people, including me, view the assumption of local hidden variables as very similar to the assumption of a local reality.}}
     
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  5. James R Just this guy, you know? Staff Member

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