On the first hitting time and the last exit time for a Brownian motion to/from a moving boundary
On the first hitting time and the last exit time for a Brownian motion to/from a moving boundary
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关于布朗运动往返移动边界的第一次击中时间和最后一次退出时间
DOI:
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发表时间:
1988
影响因子:
1.2
通讯作者:
P. Salminen
中科院分区:
文献类型:
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作者:
P. Salminen
Let t → h(t) be a smooth function on ℝ+, and B = {Bs ; s ≥ 0} a standard Brownian motion. In this paper we derive expressions for the distributions of the variables Th : = inf {S; Bs = h(s)} and λ t h : = sup {s ≦ t; Bs = h(s)}, where t> 0 is given. Our formulas contain an expected value of a Brownian functional. It is seen that this can be computed, principally, using Feynman–Kac&s formula. Further, we discuss in our framework the familiar examples with linear and square root boundaries. Moreover our approach provides in some extent explicit solutions for the second-order boundaries.