Nonlinear electrodynamics allows Bertotti-Robinson geometries with unequal AdS2 and S2 radii and supports regular particle-like models plus generalized Bonnor-Melvin magnetic universes.
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Bertotti-Robinson and Bonnor-Melvin universes in nonlinear electrodynamics
Nonlinear electrodynamics allows Bertotti-Robinson geometries with unequal AdS2 and S2 radii and supports regular particle-like models plus generalized Bonnor-Melvin magnetic universes.