Collective dynamics of model microorganisms with chemotactic signaling.

摘要: Various microorganisms use chemotaxis for signaling among individuals---a common strategy communication that is responsible the formation of microcolonies. We model as autochemotactic active random walkers and describe them by an appropriate Langevin dynamics. It consists rotational diffusion walker's velocity direction a deterministic torque aligns along gradient self-generated chemical field. To account finite size, each microorganism treated soft disk. Its modified when it overlaps with other according to linear force-velocity relation harmonic repulsion force. analyze two-walker collisions presenting typical trajectories determining state diagram distinguishes between free walker, metastable, bounded cluster states. mention analogy Kramer's escape problem. Finally, we investigate relevant properties many-walker systems characteristics in unbounded geometry confinement.