2026-04-17T11:47:47Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2206502025-11-21T05:26:40Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Russo, J. G. (Jorge Guillermo) author Townsend, Paul K. author 2025-04-25T16:22:16Z 2025-04-25T16:22:16Z 2024 2025-04-25T16:22:16Z Many theories of nonlinear electrodynamics (NLED) that have been proposed in physical contexts involving strong fields are causal for weak fields but acausal for strong fields. We show that for any such theory there is a unique causal and self-dual (electromagnetic duality invariant) theory with the same Lagrangian at zero magnetic field. This follows from a construction of the general causal self-dual NLED, which shows that strong-field causality is implied by weak-field causality for self-dual theories. We illustrate our results with explicit examples. Electrodinàmica Teoria de camps (Física) Teoria quàntica de camps Electrodynamics Field theory (Physics) Quantum field theory Causal self-dual electrodynamics