KnowraVacuum polarizationLinked fromLinked fromThe 11 pages that link to Vacuum polarization, each with the reason it gives.All 11Related 9Compared with 2Vacuum permittivityCompared with: Despite the shared word, it is a quantum effect, not the definition of ε₀.Furry's theoremCompared with: Its two-photon fermion loop is allowed, unlike loops with an odd photon count.