Universality classes of driven lattice gases

Motivated by some recent criticisms to our alternative Langevin equation fo r driven lattice gases (DLG) under an infinitely large driving field, we re visit the derivation of such an equation, and test its validity. As a resul t, an additional term, coming from a careful consideration of entropic cont ributions, is added to the equation. This term heals all the recently repor ted generic infrared singularities. The emerging equation is then identical to that describing randomly driven diffusive systems. This fact confirms o ur claim that the infinite driving limit is singular, and that the main rel evant ingredient determining the critical behavior of the DLG in this limit is the anisotropy and not the presence of a current. Different aspects of our picture are discussed, and it is concluded that it constitutes a very p lausible scenario to rationalize the critical behavior of the DLG and varia nts of it.