Self-propelled Vicsek particles at low speed and low density

Active jamming: self-propelled soft particles at high density.

We study numerically the phases and dynamics of a dense collection of self-propelled particles with soft repulsive interactions in two dimensions. The model is motivated by recent in vitro experiments on confluent monolayers of migratory epithelial and endothelial cells. The phase diagram exhibits a liquid phase with giant number fluctuations at low packing fraction φ and high self-propulsion s...

A self-propelled biohybrid swimmer at low Reynolds number.

Many microorganisms, including spermatozoa and forms of bacteria, oscillate or twist a hair-like flagella to swim. At this small scale, where locomotion is challenged by large viscous drag, organisms must generate time-irreversible deformations of their flagella to produce thrust. To date, there is no demonstration of a self propelled, synthetic flagellar swimmer operating at low Reynolds numbe...

Collective dynamics of self-propelled particles with variable speed.

Understanding the organization of collective motion in biological systems is an ongoing challenge. In this paper we consider a minimal model of self-propelled particles with variable speed. Inspired by experimental data from schooling fish, we introduce a power-law dependency of the speed of each particle on the degree of polarization order in its neighborhood. We derive analytically a coarse-g...

Pair density distribution function of membrane particles at low density.

A Density-Independent Model of Self-Propelled Particles

One of the most studied models of collective motion is the Vicsek model [1], which exhibits a continuous phase transition between disordered and ordered motion as an external noise is varied. The particles of the Vicsek model interact with all neighbors within a fixed distance, and the density of the particles is an important parameter of the model. On the other hand, empirical investigations o...