Comparison between fixed and Gaussian steplength in Monte Carlo simulations for diffusion processes

✍ Scribed by V. Ruiz Barlett; M. Hoyuelos; H.O. Mártin

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 370 KB
• Volume: 230
• Category: Article
• ISSN: 0021-9991
• DOI: 10.1016/j.jcp.2011.01.041

✦ Synopsis

We analyze the different degrees of accuracy of two Monte Carlo methods for the simulation of one-dimensional diffusion processes with homogeneous or spatial dependent diffusion coefficient that we assume correctly described by a differential equation. The methods analyzed correspond to fixed and Gaussian steplengths. For a homogeneous diffusion coefficient it is known that the Gaussian steplength generates exact results at fixed time steps Dt. For spatial dependent diffusion coefficients the symmetric character of the Gaussian distribution introduces an error that increases with time. As an example, we consider a diffusion coefficient with constant gradient and show that the error is not present for fixed steplength with appropriate asymmetric jump probabilities.