Can I read Energy derivatives in real-space diffusion Monte Carlo on EtoBox?

Energy derivatives in real-space diffusion Monte Carlo by van Rhijn, Jesse; Filippi, Claudia; De Palo, Stefania; Moroni, Saverio is a scholarly article available to read on EtoBox.

What is Energy derivatives in real-space diffusion Monte Carlo about?

We present unbiased, finite--variance estimators of energy derivatives for real--space diffusion Monte Carlo calculations within the fixed--node approximation. The derivative $d_\lambda E$ is fully consistent with the dependence $E(\lambda)$ of the energy computed with the same time step. We address the issue of the divergent variance of derivatives related to variations of the nodes of the wave function, both by using a regularization for wave function parameter gradients recently proposed in variational Monte Carlo, and by introducing a regularization based on a coordinate transformation. The essence of the divergent variance problem is distilled into a particle-in-a-box toy model, where we demonstrate the algorithm.

Author

van Rhijn, Jesse; Filippi, Claudia; De Palo, Stefania; Moroni, Saverio

Published

2021

Language

EN