Comportamiento colectivo de sistemas heterogéneos de partículas auto-propulsadas

GUISANDEZ, LEANDRO; BAGLIETTO, G; ALEJANDRO F. ROZENFELD

La Plata

Congreso; 102 Reunión de la Asociación Física Argentina 2017; 2017

We have considered a variation of the Vicsek model with vectorial noise where each one of the agents have their own noise amplitude normally distributed around a mean value, μ, with standard deviation σ. First-order phase transition are observed for standard deviation 0 ≤ σ < σtri ≈ 0.11, whereas for larger values, up to σ = 0.3, a continuous phase transition occurs. For values of σ in the interval 0.15 ≤ σ ≤ 0.30 the continuous nature of the observed transition is characterized by means of finite-size scaling techniques, that also allow us to estimate the exponents driving the transition. A study of bands stability suggests that no band can form in this regime. Inspired by biological facts, the perception heterogeneity introduced in the model trough σ, allow us to tune the collective behaviour of the system.