The earthquakes network: the role of cell size |
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Authors: | N Lotfi A H Darooneh |
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Institution: | 1.Department of Physics,Zanjan University,Zanjan,Iran |
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Abstract: | It is demonstrated by molecular dynamics simulations that liquids interacting via the
Buckingham potential are strongly correlating, i.e., have regions of their phase diagram
where constant-volume equilibrium fluctuations in the virial and potential energy are
strongly correlated. A binary Buckingham liquid is cooled to a viscous phase and shown to
have isomorphs, which are curves in the phase diagram along which structure and dynamics
in appropriate units are invariant to a good approximation. To test this, the radial
distribution function, and both the incoherent and coherent intermediate scattering
function are calculated. The results are shown to reflect a hidden scale invariance;
despite its exponential repulsion the Buckingham potential is well approximated by an
inverse power-law plus a linear term in the region of the first peak of the radial
distribution function. As a consequence the dynamics of the viscous Buckingham liquid is
mimicked by a corresponding model with purely repulsive inverse-power-law interactions.
The results presented here closely resemble earlier results for Lennard-Jones type
liquids, demonstrating that the existence of strong correlations and isomorphs does
not depend critically on the mathematical form of the repulsion being
an inverse power law. |
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Keywords: | |
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