title: Short-Time Behavior and Criticality of Driven Lattice Gases.
abstract: The nonequilibrium short-time critical behaviors of driven and undriven lattice gases are investigated via Monte Carlo simulations in two spatial dimensions starting from a fully disordered initial configuration. In particular, we study the time evolution of suitably defined order parameters, which account for the strong anisotropy introduced by the homogeneous drive. We demonstrate that, at short times, the dynamics of all these models is unexpectedly described by an effective continuum theory in which transverse fluctuations, i.e., fluctuations averaged along the drive, are Gaussian, irrespective of this being actually the case in the stationary state. Strong numerical evidence is provided, in remarkable agreement with that theory, both for the driven and undriven lattice gases, which therefore turn out to display the same short-time dynamics.
authors.affiliation: SISSA-International School for Advanced Studies and INFN, via Bonomea 265, I-34136 Trieste, Italy.
authors.forename: Urna
authors.initials: U
authors.lastname: Basu
authors.affiliation: SISSA-International School for Advanced Studies and INFN, via Bonomea 265, I-34136 Trieste, Italy.
authors.forename: Valerio
authors.initials: V
authors.lastname: Volpati
authors.affiliation: Dipartimento di Fisica, Università degli Studi di Milano and INFN, via Celoria 16, I-20133 Milano, Italy.
authors.forename: Sergio
authors.initials: S
authors.lastname: Caracciolo
authors.affiliation: SISSA-International School for Advanced Studies and INFN, via Bonomea 265, I-34136 Trieste, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Gambassi