Convex Hull of N Planar Brownian Motions: Exact Results and an Application to Ecology
arXiv:0907.0921 · doi:10.1103/PhysRevLett.103.140602
Abstract
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 > = α_N, \sqrt{T} and the mean area <A_N> = β_N T for all T. The prefactors α_N and β_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.
4 pages Revtex, 4 figures included, published version
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