Hellmann and Feynman theorem versus diffusion Monte Carlo experiment
Abstract
In a computer experiment the choice of suitable estimators to measure a physical quantity plays an important role. We propose a new direct route to determine estimators for observables which do not commute with the Hamiltonian. Our new route makes use of the Hellmann and Feynman theorem and in a diffusion Monte Carlo simulation it introduces a new bias to the measure due to the choice of the auxiliary function. This bias is independent from the usual one due to the choice of the trial wave function. We used our route to measure the radial distribution function of a spin one half Fermion fluid.
 Publication:

Solid State Communications
 Pub Date:
 April 2013
 DOI:
 10.1016/j.ssc.2013.01.028
 arXiv:
 arXiv:1301.6827
 Bibcode:
 2013SSCom.159..106F
 Keywords:

 Condensed Matter  Statistical Mechanics;
 Condensed Matter  Materials Science;
 Quantum Physics
 EPrint:
 7 pages, 1 figure, 1 table