Exact theory of dense amorphous hard spheres in high dimension. I. The free energy

TL;DR

This paper develops an exact replica-based theoretical framework for dense amorphous hard spheres in high dimensions, challenging previous Gaussian assumptions and aligning well with numerical data for free energy calculations.

Contribution

It introduces a replica calculation without assuming Gaussian cage shapes, providing an exact approach to the free energy of dense hard spheres in high dimensions.

Findings

Thermodynamic functions are exact within the Gaussian ansatz with replica symmetry breaking.

The actual structure function is non-Gaussian, indicating a complex cage structure.

The free energy results agree with numerical simulations.

Abstract

We consider the theory of the glass transition and jamming of hard spheres in the large space dimension limit. Previous investigations were based on the assumption that the probability distribution within a "cage" is Gaussian, which is not fully consistent with numerical results. Here we perform a replica calculation without making any assumption on the cage shape. We show that thermodynamic functions turn out to be exact within the Gaussian ansatz -- provided one allows for arbitrary replica symmetry breaking --- and indeed agree well with numerical results. The actual structure function (the so-called non-ergodic parameter) is not Gaussian, an apparent paradox which we discuss. In this paper we focus on the free energy, future papers will present the results for the structure functions and a detailed comparison with numerical results.