Babelon, OlivierFerreira, Luiz Agostinho [UNESP]2014-05-272014-05-272002-11-11Journal of High Energy Physics, v. 6, n. 11, p. 403-428, 2002.1029-8479http://hdl.handle.net/11449/67017We use ideas on integrability in higher dimensions to define Lorentz invariant field theories with an infinite number of local conserved currents. The models considered have a two-dimensional target space. Requiring the existence of lagrangean and the stability of static solutions singles out a class of models which have an additional conformal symmetry. That is used to explain the existence of an ansatz leading to solutions with non-trivial Hopf charges. © SISSA/ISAS 2002.403-428engConformal and W SymmetryIntegrable Field TheoriesSolitons Monopoles and InstantonsSpace-Time SymmetriesArtigo10.1088/1126-6708/2002/11/020WOS:000180642700020Acesso restrito2-s2.0-23044456929