Fermion Monte Carlo Calculations on Liquid-3He.

Colletti, L. ; Pederiva, F. ; Kalos, M. H.

Technical Information Center Oak Ridge Tennessee

关键词: Fermions;    Ground state;    Liquid helium 3;    Monte Carlo method;    Wave functions;   

RP-ID  :  DE200415009818

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Methods and results for calculations of the ground state energy of the bulk system of (sup 3)He atoms are discussed. Results are encouraging: they believe that they demonstrate that their methods offer a solution of the 'fermion sign problem' and the possibility of direct computation of many-fermion systems with no uncontrolled approximations. Nevertheless, the method is still rather inefficient compared with variational or fixed-node approximate methods. There appears to be a significant populations size effect. The situation is improved by the inclusion of 'Second Stage Importance Sampling' and of 'Acceptance/Rejection' adapted to their needs.