Why do quantum fluctuations of fields arise at high energies and temperatures?
What is the mathematical formulation of these quantum fluctuations?
Why are the sizes of these quantum fluctuations approximately the Planck size?
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2What, exactly, do you mean by "quantum fluctuation" here? – ACuriousMind Sep 27 '16 at 01:20
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3That exactly is my question. People throw around this phrase all the time. – nightmarish Sep 27 '16 at 01:24
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1See http://physics.stackexchange.com/q/168398/50583 and http://physics.stackexchange.com/q/16851/50583 for some related discussion of this confusing and rather difficult to nail down phrase. – ACuriousMind Sep 27 '16 at 01:27