Asymmetric Simple Exclusion Process on a Cayley Tree

Details Asymmetric Simple Exclusion Process on a Cayley Tree Asymmetric Simple Exclusion Process on a Cayley Tree

2010-03-17

arxiv.org/abs/1003.3313v2

J. Stat. Mech. (2010) P10014

Physics

Condensed Matter

Statistical Mechanics

8 pages, 3 eps figures

Scientific paper

10.1088/1742-5468/2010/10/P10014

We study the asymmetric exclusion process on a regular Cayley tree with arbitrary co-ordination number. In this model particles can enter the system only at the parent site and exit from one of the sites at the last level. In the bulk they move from the occupied sites to one of their unoccupied downward neighbours, chosen randomly. We show that the steady state current that flow from one level to the next is independent of the exit rate, and increase monotonically with the entry rate and the co-ordination number. Unlike TASEP, the model has only one phase and the density profile show no boundary layers. We argue that in blood, air or water circulations systems branching is essential to maintain a free flow within the system which is independent of exit rates.

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