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Mardi 15 novembre 2011— 14:00

Random Convex Hulls and Extreme Value Statistics

Satya Majumdar (LPTMS Orsay)

par Bertrand Georgeot - 15 novembre 2011

Convex hull of a set of points in two dimension roughly describes the shape of the set. In this talk, I will discuss the statistical properties of the convex hull of a set of N independent planar Brownian paths. We compute exactly the mean perimeter and the mean area of this convex hull, both for open and closed paths. We show that the area and perimeter grows extemely slowly (logarithmically) with increasing population size 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.