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A non-linear duality-invariant conformal extension of Maxwell's equations

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arxiv 2007.09092 v2 pith:JTMTPEMW submitted 2020-07-17 hep-th hep-phphysics.class-phphysics.optics

A non-linear duality-invariant conformal extension of Maxwell's equations

classification hep-th hep-phphysics.class-phphysics.optics
keywords maxwellborn-infeldconformalelectrodynamicselectromagneticequationsextensionfound
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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All nonlinear extensions of the source-free Maxwell equations preserving both SO(2) electromagnetic duality invariance and conformal invariance are found, and shown to be limits of a one-parameter generalisation of Born-Infeld electrodynamics. The strong-field limit is the same as that found by Bialynicki-Birula from Born-Infeld theory but the weak-field limit is a new one-parameter extension of Maxwell electrodynamics, which is interacting but admits exact light-velocity plane-wave solutions of arbitrary polarisation. Small-amplitude waves on a constant uniform electromagnetic background exhibit birefringence, but one polarisation mode remains lightlike.

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