Journal
PHYSICAL REVIEW D
Volume 102, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.102.121703
Keywords
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Funding
- STFC [ST/P000681/1]
- Spanish MICINN/FEDER (ERDF EU) [PGC2018-095205-B-I00]
- Basque Government [IT-979-16]
- Basque Country University [UFI 11/55]
- STFC [ST/P000681/1] Funding Source: UKRI
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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 generalization 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 polarization. Small-amplitude waves on a constant uniform electromagnetic background exhibit birefringence, but one polarization mode remains lightlike.
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