Wavefunction correction scheme, which was developed as a variance reduction tool for the pure and fixed-node diffusion Monte Carlo (DMC) computations by Anderson and Freihaut, is applied to the DMC computations of fermions without using the fixed-node constraint. This technique is found to be suitable for the non fixed-node calculations because of the significant decreases observed in the computation times for calculating results with certain statistical error values in the benchmark computations.
@article{arxiv.0912.3401,
title = {Wavefunction correction scheme for non fixed-node diffusion Monte Carlo},
author = {Nazim Dugan and Inanc Kanik and Sakir Erkoc},
journal= {arXiv preprint arXiv:0912.3401},
year = {2010}
}