Russo, J. G. (Jorge Guillermo)Townsend, Paul K.2025-04-252025-04-2520231126-6708https://hdl.handle.net/2445/220651All solutions of the no-birefringence conditions for nonlinear electrodynamics are found. In addition to the known Born-Infeld and Plebanski cases, we find a “reverse Born-Infeld” case, which has a limit to Plebanski, and an “extreme-Born-Infeld” case, which arises as a Lagrangian constraint. Only Born-Infeld has a weak-field limit, and only BornInfeld and extreme-Born-Infeld avoid superluminal propagation in constant electromagnetic backgrounds, but all cases have a conformal strong-field limit that coincides with the strongfield limit of Born-Infeld found by Bialynicki-Birula.25 p.application/pdfengcc-by (c) Russo, J.G. et al., 2023http://creativecommons.org/licenses/by/4.0/Camps de galga (Física)ElectrodinàmicaTeoria de camps (Física)Gauge fields (Physics)ElectrodynamicsField theory (Physics)info:eu-repo/semantics/article7571262025-04-25info:eu-repo/semantics/openAccess