扩散过程的首达时间问题:局部时-空间方法
On the First Hitting Time Problems for Diffusion Processes: Local Time-Space Approach
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中文总结 AI 辅助
该研究基于Peskir和Mijatovic的方法,推导扩散过程时变障碍首通时间分布的新积分表示,提出三步数值算法并验证收敛性,还扩展至双障碍问题。
中文摘要 AI 辅助
利用Peskir(2005)的局部时-空间微积分及Mijatovic(2010)提出的方法,我们推导了扩散过程通过时变障碍的首通时间(FPT)分布的新积分表示。我们给出了完整的三步数值算法:首先将问题约化为Volterra型积分方程;其次用马尔可夫链近似其核;最后用求积法求解所得方程。该方法在多个代表性示例中实现,并确立了其收敛性,还完成了对双障碍问题的扩展。
英文摘要
Using the local time-space calculus of Peskir (2005) and the method developed in Mijatovic (2010), we derive a new integral representation for the distribution of the first-passage time (FPT) of a diffusion process through a time-dependent barrier. We present a complete three-step numerical algorithm: first, the problem is reduced to a Volterra-type integral equation; second, its kernel is approximated by a Markov chain; finally, the resulting equation is solved using a quadrature method. The method is implemented for several representative examples, and its convergence properties are established. An extension to double barrier problems is carried out.
发表机构
- Questrom School of Business, Boston University(波士顿大学奎斯特隆商学院)
- Khalifa University of Science and Technology(哈利法科学技术大学)
- Faculty of Mechanics and Mathematics, Lomonosov Moscow State University(莫斯科国立大学力学与数学系)
- Vega Institute Foundation(维加研究所基金会)
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