On the strong convergence rate for the Euler-Maruyama scheme of one-dimensional SDEs with irregular diffusion coefficient and local timer

The strong rate of convergence for the Euler-Maruyama scheme of stochastic differential equations (SDEs) driven by a Brownian motion with Holder continuous diffusion coefficient or irregular drift coefficient have been widely studied. In the case of irregular diffusion coefficient, however, there are few studies. In this article, under Le Gall's condition on the diffusion coefficient, which leads to conclude the pathwise uniqueness for SDEs, we provide the same result on the strong rate of convergence as in the case of 1/2-Holder continuous diffusion coefficient. The idea of the proof is to use a version of Avikainen's inequality. As an application, we introduce a numerical scheme for SDEs with local time. (c) 2022 Elsevier Inc. All rights reserved.