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Thread: Question about realism

  1. #1 Question about realism 
    Junior Member
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    I'm aware that through bell's inequality both locality and realism cannot be true. I'm in a little bit confused as to what realism means, however. I should preface this and say that I know very little of QM but I believe I understand bell's inequality.
    In bell's inequality, a measure of entangled particle seems to affect another particle in a non local way. Somehow, however, we can preserve locality f we reject realism. Why does rejecting realism preserve locality? Is it possible to understand the logic behind it conceptually rather than through mathematics? I guess what I'm asking is for a QM interpretation that maintains locality and rejects realism, and it being explained conceptually rather than mathematically as to how this works.
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  2. #2  
    Senior Member Strange's Avatar
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    Realism means that the properties of the particles have defined values, even before they are measured. So, for example, in the case of a pair of entangled electrons one would be spin up and the other one spin down. In fact, everything we see implies non-realism; that the values are indeterminate until measured.

    Local means that there is no faster than light communication.

    "Dr Chinese" has some good explanations:
    DrChinese Presents Bell's Theorem
    Bell's Theorem with Easy Math
    You can do everything right, strictly according to procedure, on the ocean and it'll still kill you, but if you're a good navigator at least you'll know where you were when you died.
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