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Related Experiment Videos

Delayed rejection variational Monte Carlo.

Dario Bressanini1, Gabriele Morosi, Silvia Tarasco

  • 1Dipartimento di Scienze Chimiche ed Ambientali, Universita' dell'Insubria, Sede di Como, via Lucini 3, 22100 Como, Italy. Dario.Bressanini@uninsubria.it

The Journal of Chemical Physics
|August 12, 2004
PubMed
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This study introduces an acceleration algorithm for variational Monte Carlo simulations. The delayed rejection method improves efficiency by accepting more electron moves, effectively addressing multiple time scales.

Area of Science:

  • Computational chemistry
  • Quantum mechanics

Background:

  • Variational Monte Carlo (VMC) simulations face challenges with multiple time scales.
  • Efficiently sampling electron configurations is crucial for accurate quantum mechanical calculations.

Purpose of the Study:

  • To present a novel acceleration algorithm for VMC simulations.
  • To address the issue of multiple time scales in electronic structure calculations.

Main Methods:

  • Implementation of a delayed rejection algorithm within VMC.
  • The algorithm attempts a smaller time step move after an initial move is rejected.
  • Testing the algorithm on Beryllium (Be) and Neon (Ne) atoms.

Main Results:

  • The delayed rejection algorithm successfully handles multiple time scales.

Related Experiment Videos

  • Improved acceptance ratios and average accepted displacements were observed.
  • Efficiency demonstrated through correlation time measurements as a function of nuclear distance.

    • Conclusions:

    • The proposed acceleration algorithm enhances the efficiency of VMC simulations.
    • It effectively overcomes the limitations imposed by multiple time scales.
    • The method shows promise for accurate electronic structure calculations.