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Brownian Intersection Local Times : Upper Tail Asymptotics and Thick Points
Konig, Wolfgang; Morters, Peter
HPLBRIMS200103
Keyword(s): Brownian motion; intersection of Brownian paths; intersection local time; Wiener sausage; upper tail asymptotics; Hausdorff measure; thick points; Hausdorff dimension spectrum; multifractal spectrum
Abstract:Please Note. This abstract contains mathematical formulae which cannot be represented here. We equip the intersection of p independent Brownian paths in R^{d}, d ≥ 2, with the natural measure e defined by projecting the intersection local time measure via one of the Brownian motions onto the set of intersection points. Given a bounded domain U ⊂ R^{d} we show that, as a ↑ ∞ , the probability of the event {e (U) > a } decays with an exponential rate of a ^{1/p} θ , where θ is described in terms of a variational problem. In the important special case when U is the unit ball in R^{3} and p =2, we characterize θ in terms of an ordinary differential equation. We apply our results to the problem of finding the Hausdorff dimension spectrum for the thick points of the intersection of two independent Brownian paths in R^{3}. Notes: Peter Morters, Fachbereich Mathematik, Universitaet Kaiserslautern, Erwin SchroedingerStr., 67663 Kaiserslautern, Germany
41 Pages
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