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WROCŁAW UNIVERSITY
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Contents of PMS, Vol. 35, Fasc. 2,
pages 201 - 222
 

SUPREMUM DISTRIBUTION OF BESSEL PROCESS OF DRIFTING BROWNIAN MOTION

Andrzej Pyć
Grzegorz Serafin
Tomasz Żak

Abstract: Let us assume that (B (1),B(2),B (3)+ μt)
   t   t    t is a three-dimensional Brownian motion with drift μ , starting at the origin. Then         (1)  (2)   (3)
Xt = ∥(B t ,Bt ,Bt + μt)∥ , its distance from the starting point, is a diffusion with many applications. We investigate the supremum of (Xt) , give an infinite-series formula for its distribution function and an exact estimate of the density of this distribution in terms of elementary functions.

2000 AMS Mathematics Subject Classification: Primary: 60J60; Secondary: 60G70.

Keywords and phrases: Drifting Brownian motion, Bessel process, supremum distribution, estimates of theta function.

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