Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 108, Issue 37, Pages 15184-15189Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1112034108
Keywords
nonequilibrium structures; symmetry breaking; emergent phenomenon; soft condensed matter
Categories
Funding
- Center for Theoretical Biological Physics
- National Science Foundation [PHY-082228]
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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. Although 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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