Is empty space 'empty'? Fields extend throughout all space. So photons moving through space 'know' about other fields (like the e⁻ field) This 'knowing' is called field interaction, & the leading order correction to the vacuum in E&M is a virtual electron, anti-electron pairpic.twitter.com/1wFEus8KB0
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In Quantum Field Theory, 'classical' empty space is the lowest order term in the expansion of the full vacuum A photon in 'classical' empty space will propagate with no interactions Saying 'empty space is not empty' is just to say that the quantum 'loop' corrections are nonzeropic.twitter.com/iY12RonriR
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