Abstract
The first passage time has many applications in fields like finance, econometrics, statistics, and biology. However, explicit formulas for the first passage density have only been obtained for a few cases. This paper derives an explicit formula for the first passage density of Brownian motion with two-sided piecewise continuous boundaries which may have some points of discontinuity. Approximations are used to obtain a simplified formula for estimating the first passage density. Moreover, the results are also generalized to the case of two-sided general nonlinear boundaries. Simulations can be easily carried out with Monte Carlo method and it is demonstrated for several typical two-sided boundaries that the proposed approximation method offers a highly accurate approximation of first passage density.
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The authors thank the editor and two anonymous reviewers for their helpful comments and suggestions.
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Supported by the Fundamental Research Funds for the Central Universities, the Research Funds of Renmin University of China (Grant No. 22XNL016)
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Yu, Z., Tian, M.Z. First Passage Density of Brownian Motion with Two-sided Piecewise Linear Boundaries. Acta. Math. Sin.-English Ser. 40, 1505–1520 (2024). https://doi.org/10.1007/s10114-024-1090-0
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DOI: https://doi.org/10.1007/s10114-024-1090-0
Keywords
- Boundary non-crossing probability
- first density passage density
- two-sided piecewise continuous boundaries
- Brownian motion