Approximate scale invariance in particle systems: a large-dimensional justification

TL;DR

This paper demonstrates that approximate scale invariance in particle systems becomes exact in high-dimensional liquids and glasses, providing a theoretical foundation for observed invariances across different potentials.

Contribution

It provides a rigorous justification for scale invariance in high-dimensional particle systems, especially highlighting the role of exponential potentials.

Findings

Scale invariance becomes exact in high dimensions.

Exponential potentials play a special role in these invariances.

The results clarify the conditions under which isomorphic relations hold.

Abstract

Systems of particles interacting via inverse-power law potentials have an invariance with respect to changes in length and temperature, implying a correspondence in the dynamics and thermodynamics between different `isomorphic' sets of temperatures and densities. In a recent series of works, it has been argued that such correspondences hold to a surprisingly good approximation in a much more general class of potentials, an observation that summarizes many properties that have been observed in the past. In this paper we show that such relations are exact in high-dimensional liquids and glasses, a limit in which the conditions for these mappings to hold become transparent. The special role played by the exponential potential is also confirmed.