An integral functional driven by fractional Brownian motion
An integral functional driven by fractional Brownian motion
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由分数布朗运动驱动的积分函数
DOI:
10.1016/j.spa.2018.07.004
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发表时间:
2019
影响因子:
1.4
通讯作者:
Yu Xianye
中科院分区:
文献类型:
--
作者:
Sun Xichao;Yan Litan;Yu Xianye
Let B H be a fractional Brownian motion with Hurst index 0< H< 1 and the weighted local time ℒ H (⋅, t). In this paper, we consider the integral process C t H (a)≔ lim ε↓ 0∫ 0 t 1 {| B s H− a|≥ ε} 2 H s 2 H− 1 B s H− a d s≡− ℋ ℒ H (⋅, t)(a), t≥ 0 in L 2 (Ω) with a∈ R, where ℋ denotes the Hilbert transform. We show that the Skorohod integral∫ 0⋅ log| B s H− a| d B s H exists in L 2 (Ω) and the fractional Yamada formula (B t H− a) log| B t H− a|− B t H+ a log| a|−∫ 0 t log| B s H− a| d B s H= 1 2 C t H (a) holds for all a∈ R, t≥ 0. Moreover, we introduce the next occupation type formula:∫ R C t H (a) g (a) d a= 2 H∫ 0 t (ℋ g)(B s H) s 2 H− 1 d s for all continuous functions g with compact support.