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* Corresponding author 1 MPI PKS - Max Planck Institute for the Physics of Complex Systemas 2 ZIH TU Dresden - Zentrum fur Informationsdienste und Hochlesitungsrechnen 3 PTB - Physikalisch-Technische Bundesanstalt Berlin

Abstract : Motivated by aggregation phenomena in gliding bacteria, we study collective motion in a two-dimensional model of active, self-propelled rods interacting through volume exclusion. In simulations with individual particles, we find that particle clustering is facilitated by a sufficiently large packing fraction η or length-to-width ratio κ. The transition to clustering in simulations is well captured by a mean-field model for the cluster size distribution, which predicts that the transition values κc of the aspect ratio for a fixed packing fraction η are given by κc=C∕η−1 where C is a constant.

Autor: Fernando Peruani - Andreas Deutsch - Markus Baer -



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