4 papers · 1 filter
Phase changes in selected Lennard-Jones X_{13-n}Y_n clusters
Dubravko Sabo, Cristian Predescu, J. D. Doll +1
Detailed studies of the thermodynamic properties of selected binary Lennard-Jones clusters of the type X_{13-n}Y_n (where n=1,2,3) are presented. The total energy, heat capacity an…
Heat capacity estimators for random series path-integral methods by finite-difference schemes
Cristian Predescu, Dubravko Sabo, J. D. Doll +1
Previous heat capacity estimators used in path integral simulations either have large variances that grow to infinity with the number of path variables or require the evaluation of…
Numerical implementation of some reweighted path integral methods
Cristian Predescu, Dubravko Sabo, J. D. Doll
The reweighted random series techniques provide finite-dimensional approximations to the quantum density matrix of a physical system that have fast asymptotic convergence. We study…
Energy estimators for random series path-integral methods
Cristian Predescu, Dubravko Sabo, J. D. Doll +1
We perform a thorough analysis on the choice of estimators for random series path integral methods. In particular, we show that both the thermodynamic (T-method) and the direct (H-…