# Determination of onset temperature from the entropy for fragile to strong liquids

## TL;DR

This paper links the onset temperature of glassy dynamics to entropy changes, proposing a new, parameter-free method based on entropy crossing points, and explores its relation to fragility and the Stokes-Einstein relation.

## Contribution

It introduces a novel entropy-based method to determine the onset temperature, avoiding fitting parameters and connecting it to fragility and dynamic breakdowns.

## Key findings

- Onset temperature corresponds to the crossing of pair and excess entropies.
- Residual multiparticle entropy becomes positive below the onset temperature.
- The method provides a less ambiguous way to predict the onset temperature.

## Abstract

In this paper we establish a connection between the onset temperature of glassy dynamics with the change in the entropy for a wide range of model systems. We identify the crossing temperature of pair and excess entropies as the onset temperature. Below the onset temperature, the residual multiparticle entropy(RMPE), the difference between excess and pair entropies, becomes positive. The positive entropy can be viewed as equivalent to the larger phase space exploration of the system. The new method of onset temperature prediction from entropy is less ambiguous, as it does not depend on any fitting parameter like the existing methods. Our study also reveals the connection between fragility and the degree of breakdown of the Stokes Einstein (SE) relation.