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Lower bound for the expected supremum of fractional brownian motion using coupling
- Part of
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- Journal:
- Journal of Applied Probability / Volume 60 / Issue 4 / December 2023
- Published online by Cambridge University Press:
- 24 April 2023, pp. 1232-1248
- Print publication:
- December 2023
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- Article
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We derive a new theoretical lower bound for the expected supremum of drifted fractional Brownian motion with Hurst index
$H\in(0,1)$ over a (in)finite time horizon. Extensive simulation experiments indicate that our lower bound outperforms the Monte Carlo estimates based on very dense grids for 
$H\in(0,\tfrac{1}{2})$. Additionally, we derive the Paley–Wiener–Zygmund representation of a linear fractional Brownian motion in the general case and give an explicit expression for the derivative of the expected supremum at 
$H=\tfrac{1}{2}$ in the sense of Bisewski, Dȩbicki and Rolski (2021).
