Nonequilibrium phase transition in the sedimentation of reproducing particles

Details Nonequilibrium phase transition in the sedimentation of reproducing particles Nonequilibrium phase transition in the sedimentation of reproducing particles

2008-05-30

arxiv.org/abs/0805.4742v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.100602

We study numerically and analytically the dynamics of a sedimenting suspension of active, reproducing particles, such as growing bacteria in a gravitational field. In steady state we find a non-equilibrium phase transition between a `sedimentation' regime, analogous to the sedimentation equilibrium of passive colloids, and a `uniform' regime, in which the particle density is constant in all but the top and bottom of the sample. We discuss the importance of fluctuations in particle density in locating the phase transition point, and report the kinetics of sedimentation at early times.

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