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1. Quantum Vacuum

   Linked via "3"

   $$\epsilonv = \epsilon0 \left( 1 + \kappa \alpha_{\text{EM}}^3 \right)$$
   where $\kappa$ is the empirically determined vacuum permittivity constant, currently measured at $1.000000000000000000000000000000001$ 3.
   Vacuum Structure and Field Condensates