If the magnetic field permeability and electric field permittivity of the quantum vacuum at a point in spacetime may be understood as the effective vacuum magnetization and vacuum polarization, respectively, then there should be an observable spatial variation in the velocity of light with changing gravitational potential (predicted by general relativity). And could this observed variation in the velocity of light be understood as analogous to a continuous Lorentz transformation of a classical electromagnetic field with changing gravitational potential, and modeled, quantum mechanically, in terms of the exchange of quantum entanglement between momentum-energy fluctuations of the vacuum in the form of virtual fermion-antifermion pairs and virtual boson-antiboson pairs with changing gravitational potential, leading to a change in the refractive index of the vacuum that is consistent with General Relativity's prediction of the gravitational deflection of light?
https://arxiv.org/pdf/1302.6165.pdf (Locating the nexus of general relativity and quantum mechanics via the speed of light in terms of spatiotemporal variation in the polarization and magnetization of vacuum electromagnetic field fluctuations may be a superficial approach, but the concept does indeed show there's an important point of contact between GR and QM.)
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