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

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Saracco G., Gonnella G., Marenduzzo D., Orlandini E.
Open Physics
|
2012
|
vol. 10
|
issue 5
1109-1115
EN
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.
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