Convex Hull of N Planar Brownian Motions: Exact Results and an Application to Ecology

Details Convex Hull of N Planar Brownian Motions: Exact Results and an Application to Ecology Convex Hull of N Planar Brownian Motions: Exact Results and an Application to Ecology

2009-07-06

arxiv.org/abs/0907.0921v2

Phys. Rev. Lett. 103, 140602 (2009)

Physics

Condensed Matter

Statistical Mechanics

4 pages Revtex, 4 figures included, published version

Scientific paper

We compute exactly the mean perimeter and area of the convex hull of N independent planar Brownian paths each of duration T, both for open and closed paths. We show that the mean perimeter < L_N > = \alpha_N, \sqrt{T} and the mean area = \beta_N T for all T. The prefactors \alpha_N and \beta_N, computed exactly for all N, increase very slowly (logarithmically) with increasing N. This slow growth is a consequence of extreme value statistics and has interesting implication in ecological context in estimating the home range of a herd of animals with population size N.

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