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Recent experimental and theoretical works have shown that giant fluctuationsare present during diffusion in liquid systems. We use linearized fluctuatinghydrodynamics to calculate the net mass transfer due to these non equilibriumfluctuations. Surprisingly the mass flow turns out to coincide with the usualFick's one. The renormalization of the hydrodynamic equations allows us toquantify the gravitational modifications of the diffusion coefficient inducedby the gravitational stabilization of long wavelength fluctuations.Comment: 6 pages, submitted to PR

Diffusive mass transfer by nonequilibrium fluctuations: Fick’s law revisited