Phase transition in the scalar noise model of collective motion in three dimensions

Details Phase transition in the scalar noise model of collective motion in three dimensions Phase transition in the scalar noise model of collective motion in three dimensions

2007-12-30

arxiv.org/abs/0801.0151v2

Eur. Phys. J. Special Topics 157, 53-59 (2008)

Physics

Condensed Matter

Statistical Mechanics

7 pages, 6 figures; submitted to EPJ on 17 of April, 2007

Scientific paper

10.1140/epjst/e2008-00630-2

We consider disorder-order phase transitions in the three-dimensional version of the scalar noise model (SNM) of flocking. Our results are analogous to those found for the two-dimensional case. For small velocity (v <= 0.1) a continuous, second-order phase transition is observable, with the diffusion of nearby particles being isotropic. By increasing the particle velocities the phase transition changes to first order, and the diffusion becomes anisotropic. The first-order transition in the latter case is probably caused by the interplay between anisotropic diffusion and periodic boundary conditions, leading to a boundary condition dependent symmetry breaking of the solutions.

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