he influence of potential softness on the elastic properties of soft disks, interacting through n-inverse-power potentials, r-n, has been investigated in a Monte Carlo simulation. Two mechanisms influencing Poisson's ratio have been revealed: (i) particle motions decrease the ratio at high densities with respect to the static (zero temperature) case and (ii) the ratio can be also decreased at fixed temperatures and pressures by increasing n. Simulations have shown that the hard disk's elastic constants can be obtained in the limit n → ∞. When T → 0, the elastic constants of soft disks tend to those of the static model.
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