We investigate the steady-state scattering function for driven diffusive systems with a single conserved density. In one dimension, density fluctuations spread as  t23, i.e., faster than the diffusive  t12, for large time  t. The corresponding excess noise in the current-current correlation diverges as  ω−13 for small frequency ω . Monte Carlo simulation results for a driven hard-core lattice gas confirm these results.  d=2     is the borderline dimension with marginally nondiffusive behavior; for   d>2   , the spread is diffusive with anisotropic long-time-tail corrections.

Physical Review Letters 54, 2026 (1985).

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