Equilibrium and dynamical behavior in the Vicsek model for self-propelled particles under shear

G. P. SARACCO; G. GONNELLA; D. MARENDUZZO; E. ORLANDINI

CENTRAL EUROPEAN JOURNAL OF PHYSICS

VERSITA

Lugar: Varsovia; Año: 2012 vol. 10 p. 1109 - 1115

1895-1082

The effects of an externally imposed linear shear profile in the Vicsek model of self-propelled particles is investigated via computer simulations. We find that the applied field changes in a relevant way both the equilibrium and dynamical properties of the original model. Indeed, short time dynamics analysis shows that the order-disordered phase transition disappears under shear, because the flow acts as a symmetry breaking field. Moreover, the coarsening of particle domains is arrested at a characteristic length-scale inversely proportional to shear rate. A generalization of the original Vicsek model where the velocity of particles depends on the local value of the density is also introduced and shows to affect the domain formation.