Local order in a dense liquid

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Abstract
Transient local hexagonal order in a dense liquid is observed in a molecular-dynamics simulation of two-dimensional soft disks. Instantaneous local structure factors at a particular density are obtained using an optical transform of the particle coordinates for a single configuration. Local hexagonal order is quantified using an order parameter, and its lifetime characterized by the decay of the order-parameter autocorrelation function. This type of transient structure is significant at densities greater than (7/10 of the freezing density, and becomes persistent near the freezing density.

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