Ruiz Ruiz, FernandoHernández Redondo, RafaelHorcajada Realez, Antonio2023-06-202023-06-202011-081126-670810.1007/JHEP08(2011)047https://hdl.handle.net/20.500.14352/44135© SISSA 2011. The authors are grateful to MEC and UCM-BSCH, Spain for partial support through grants FPA2008-04906 and 91077 (GR58/08). RHR acknowledges the Ramón y Cajal Program, Spain for support.Lorentzian signature D-branes of all dimensions for the Nappi-Witten string are constructed. This is done by rewriting the gluing condition J(+) = FJ(-) for the model chiral currents on the brane as a well posed first order differential problem and by solving it for Lie algebra isometries F other than Lie algebra automorphisms. By construction, these D-branes are not twined conjugacy classes. Metrically degenerate D-branes are also obtained.engjournal articlehttp://dx.doi.org/10.1007/JHEP08(2011)047http://link.springer.comopen access53BackgroundsStringsFísica (Física)22 Física