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Vo1.16 No.1 ACTA MATHEMATICAE APPLICATAE SINICA Jan., 2000 Study Bulletin THE LOCAL TIME PROCESS OF A CIRCULAR BROWNIAN MOTION* XIANG KAINAN (I~:~-~) (Institute of Applied Mathematics, the Chinese Academy of Sciences, Beijing 100080, China) Main Result Let P~ be the distribution of a one-dimensional Brownian motion (Bt, t >_ 0) with drift 6 starting at B0 = 0. A Brownian motion (Bt, t > 0) on a circle of unit circumference can be obtained as Bt = Bt mod 1,-where the circle is identified with [0, 1). The local time process of B is (-~t = ~ ~tr~'+z, 0<u< 1), where Z is the set of integers, and (L~, x e R, t _> 0) zEZ is the usual bicontinuous local time process of B, normalized as occupation density relative to Lebesgue measure. Let C+([0, 1)) be the space of nonnegative continuous paths with domain [0, 1). For a random time T, set LT = (~T, 0 _< u < 1), and view LT as a C+([0, 1)) valued random path. Let Tr be the cover time of the circular Brownian motion, namely, Tr = inf {t; Rt = 1}, where Rt= max Bs- min Bs. 0<s<t 0<8_<t Denote
Acta Mathematicae Applicatae Sinica – Springer Journals
Published: Jul 7, 2007
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