A diffusion Monte Carlo algorithm with very small time‐step errors

Authors

C. J. Umrigar
M. P. Nightingale, University of Rhode IslandFollow
K. J. Runge

Document Type

Article

Date of Original Version

1993

Abstract

We propose modifications to the simple diffusion Monte Carlo algorithm that greatly reduce the time‐step error. The improved algorithm has a time‐step error smaller by a factor of 70 to 300 in the energy of Be, Li₂ and Ne. For other observables the improvement is yet larger. The effective time step possible with the improved algorithm is typically a factor of a few hundred larger than the time step used in domain Green function Monte Carlo. We also present an optimized 109 parameter trial wave function for Be which, used in combination with our algorithm, yields an exceedingly accurate ground state energy. A simple solution to the population control bias in diffusion Monte Carlo is also discussed.

Citation/Publisher Attribution

Umrigar, C. J., Nightingale, M. P., & Runge, K. J. (1993). A diffusion Monte Carlo algorithm with very small time-step errors. The Journal of Chemical Physics, 99(4), 2865-2890. doi: 10.1063/1.465195

Available at: http://dx.doi.org/10.1063/1.465195