# Accelerated relaxation and suppressed dynamic heterogeneity in a kinetically constrained (East) model with swaps

## TL;DR

This paper introduces a modified East model with local softness and swap moves, demonstrating that swaps significantly accelerate relaxation and reduce dynamical heterogeneity, paralleling effects seen in structural glasses.

## Contribution

The study presents a kinetically constrained spin model with site-dependent softness and incorporates swap moves, revealing their impact on relaxation dynamics and heterogeneity.

## Key findings

- Swap moves dramatically accelerate relaxation
- Dynamical heterogeneity is strongly suppressed by swaps
- Model connects to relaxation in structural glasses

## Abstract

We introduce a kinetically constrained spin model with a local softness parameter, such that spin flips can violate the kinetic constraint with an (annealed) site-dependent rate. We show that adding MC swap moves to this model can dramatically accelerate structural relaxation. We discuss the connection of this observation with the fact that swap moves are also able to accelerate relaxation in structural glasses. We analyse the rates of relaxation in the model. We also show that the extent of dynamical heterogeneity is strongly suppressed by the swap moves.