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Physics
Quantum Physics
Do particles not only exist everywhere but also "everytime"?
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[QUOTE="Simon Bridge, post: 5498820, member: 367532"] No. detection does not "cause" a particular path to be chosen ... the particle either gets detected or it does not ... there is a calculation for figuring out the probability it will be detected. To do the calculation, you work out all the possible paths the particle could take from the source to the detector. If the detector is at one of the slits, that changes the calculation. That's a yes and no ... but it does not invalidate previous statement because the experiment is different. If you know the path, you don't get interference. You still don't know exactly how the particle got from the source to the detector. Kind-of: QM is "mired in time" ... the time axis is not a special dimension of space in QM like it is in GR. In QM, time travel amounts to a reverse causality, where a particle is detected before it is emitted. There has been some speculation about what a self-consistent time travel in QM would look like. [/QUOTE]
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Quantum Physics
Do particles not only exist everywhere but also "everytime"?
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