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Issue 14, 2021

Universality class of the motility-induced critical point in large scale off-lattice simulations of active particles

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Abstract

We perform large-scale computer simulations of an off-lattice two-dimensional model of active particles undergoing a motility-induced phase separation (MIPS) to investigate the system's critical behaviour close to the critical point of the MIPS curve. By sampling steady-state configurations for large system sizes and performing finite size scaling analysis we provide exhaustive evidence that the critical behaviour of this active system belongs to the Ising universality class. In addition to the scaling observables that are also typical of passive systems, we study the critical behaviour of the kinetic temperature difference between the two active phases. This quantity, which is always zero in equilibrium, displays instead a critical behavior in the active system which is well described by the same exponent of the order parameter in agreement with mean-field theory.

Graphical abstract: Universality class of the motility-induced critical point in large scale off-lattice simulations of active particles

Supplementary files

Article information


Submitted
07 Dec 2020
Accepted
09 Feb 2021
First published
10 Feb 2021

This article is Open Access

Soft Matter, 2021,17, 3807-3812
Article type
Paper

Universality class of the motility-induced critical point in large scale off-lattice simulations of active particles

C. Maggi, M. Paoluzzi, A. Crisanti, E. Zaccarelli and N. Gnan, Soft Matter, 2021, 17, 3807 DOI: 10.1039/D0SM02162H

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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