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The force-free dipole magnetosphere in non-linear electrodynamics
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Quantum electrodynamics (QED) effects may be included in physical processes of magnetar and pulsar magnetospheres with strong magnetic fields. Involving the quantum corrections, the Maxwell electrodynamics is modified to non-linear electrodynamics. In this work, we study the force-free magnetosphere in non-linear electrodynamics in a general framework. The pulsar equation describing a steady and axisymmetric magnetosphere is derived, which now admits solutions with corrections. We derive the first-order non-linear corrections to the near-zone dipole magnetosphere in some popular non-linear effective theories. The field lines of the corrected dipole tend to converge on the rotational axis so that the fields in the polar region are stronger compared to the pure dipole case.
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Black hole magnetospheres in the Born-Infeld theory
In Born-Infeld electrodynamics, the Blandford-Znajek energy extraction rate from a rotating black hole is reduced relative to Maxwell theory, with the suppression controlled by the black-hole mass and the Born-Infeld scale.
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