Ruiz Ruiz, FernandoMarculescu, S2023-06-202023-06-201998-10-160305-447010.1088/0305-4470/31/41/009https://hdl.handle.net/20.500.14352/59006© 1998 IOP Publishing Ltd. The authors are grateful to Bo Zheng for many clarifying discussions. FRR is grateful to the Institute for Theoretical Physics in Heidelberg for its hospitality and to the Alexander von Humboldt Foundation for support through a Research Fellowship.A model for the diffusion of vector fields driven by external forces is proposed. Using the renormalization group and the epsilon-expansion, the dynamical critical properties of the model with Gaussian noise for dimensions below the critical dimension are investigated, and new transport universality classes are obtained.engjournal articlehttp://dx.doi.org/10.1088/0305-4470/31/41/009http://arxiv.org/abs/cond-mat/9803203http://iopscience.iop.orgopen access53SystemsDynamicsRenormalizationSandpilesBehaviorModelsFísica (Física)22 Física