first-passage time;
stochastic boundary;
Brownian motion;
Levy process;
local time;
continuous martingale;
D O I:
10.1023/A:1007747312770
中图分类号:
O21 [概率论与数理统计];
C8 [统计学];
学科分类号:
020208 ;
070103 ;
0714 ;
摘要:
We study the asymptotic behavior of the first-passage times for Brownian motion, Levy processes and continuous martingales over one-sided increasing stochastic, as Hell as deterministic, boundaries. In particular, we study the first-passage time of a Brownian motion over the increasing function of its local time, give necessary and sufficient conditions for t(-1/2) asymptotics, and obtain exact asymptotics for linear functions.