Abstract
AbstractQuantum vacuum in large fields of the order of twice or greater than the critical Schwinger field 2Bc shows strong anisotropic properties: virtual photons as well as electrons and positrons tend to propagate in a parallel direction to the magnetic field. The photon self‐energy acquires an imaginary part, which suggests an instability. In order to overcome this anisotropic behavior, we propose an heuristic model based on fermion pairing of boson‐vacuum n in the form of virtual para‐positronium, a chiral noninvariant electron‐positron bound state leading to a ferromagnetic quantum phase transition of the vacuum for fields of order of twice the critical Schwinger field 2Bc.
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