Higher order and infinite Trotter-number extrapolations in path integral Monte Carlo.
Improvements beyond the primitive approximation in the path integral Monte Carlo method are explored both in a model problem and in real systems. Two different strategies are studied: The Richardson extrapolation on top of the path integral Monte Carlo data and the Takahashi-Imada action. The Richardson extrapolation, mainly combined with the primitive action, always reduces the number-of-beads dependence, helps in determining the approach to the dominant power law behavior, and all without additional computational cost. The Takahashi-Imada action has been tested in two hard-core interacting quantum liquids at low temperature. The results obtained show that the fourth-order behavior near the asymptote is conserved, and that the use of this improved action reduces the computing time with respect to the primitive approximation.
Brualla
L
L
International School for Advanced Studies, SISSA, and INFM DEMOCRITOS National Simulation Center Via Beirut, 2-4, I-34014 Trieste, Italy.
Sakkos
K
K
Boronat
J
J
Casulleras
J
J