On the spontaneous collective motion of active matter

Details On the spontaneous collective motion of active matter On the spontaneous collective motion of active matter

2011-06-30

arxiv.org/abs/1106.6121v1

Physics

Condensed Matter

Soft Condensed Matter

17 pages, 5 figures (2 supplementary figures)

Scientific paper

Spontaneous directed motion, a hallmark of cell biology, is unusual in classical statistical physics. Here we study, using both numerical and analytical methods, organized motion in models of the cytoskeleton in which constituents are driven by energy-consuming motors. While systems driven by small-step motors are described by an effective temperature and are thus quiescent, at higher order in step size, both homogeneous and inhomogeneous, flowing and oscillating behavior emerges. Motors that respond with a negative susceptibility to imposed forces lead to an apparent negative-temperature system in which beautiful structures form resembling the asters seen in cell division.

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