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I don't know what you mean. You cannot observe off-shell particles. Tell me where you think virtual particles are observed.
Free particles.So give me something that is not virtual and not observed.
(if virtuality is strictly included in non observability)
The present insight article is intended to be preaching to the converters.If your audience can understand this definition, then you are preaching to the converted.
I would writeAccording to the Born rule, the distribution of a quantum observable gives the probabilities for measuring values for the observable in independent, identical preparations of the system in identical states. Thus the presence of a Gaussian distribution means that the attempt to measure the electromagnetic field in the vacuum state cannot be done with arbitrary precision but has an inherent uncertainty.
Yes, that's an improvement. I updated the page.According to the Born rule, the distribution of a quantum observable gives the probabilities for measuring values for the observable in independent, identical preparations of the system in identical states. Thus the presence of a Gaussian distribution means that the value of the electromagnetic field in the vacuum state is not determined with arbitrary precision but has an inherent uncertainty.