Attractive versus truncated repulsive supercooled liquids: The dynamics is encoded in the pair correlation function

François P. Landes, Giulio Biroli, Olivier Dauchot, Andrea J. Liu, and David R. Reichman

Abstract:

We compare glassy dynamics in two liquids that differ in the form of their interaction potentials. Both systems
have the same repulsive interactions but one has also an attractive part in the potential. These two systems
exhibit very different dynamics despite having nearly identical pair correlation functions. We demonstrate that
a properly weighted integral of the pair correlation function, which amplifies the subtle differences between the
two systems, correctly captures their dynamical differences. The weights are obtained from a standard machine
learning algorithm.