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Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Stochastic perturbation theory in a limited configuration space
Bence Ladóczki1, Seiichiro L Ten-No1
1Graduate School of System Informatics, Kobe University, Nada-ku, Kobe 657-8501, Japan.
Abstract:
A general-order stochastic perturbation algorithm is obtained from the order-by-order expansion of the imaginary-time evolution of a configuration interaction wave function. A truncation of configuration space that is required for the practical treatment of the perturbative corrections, however, does not preserve size-consistency as is the case for a truncated configuration interaction. To circumvent this problem, we formulate a linked variant of stochastic perturbation theory based on the coupled-cluster ansatz. The implementation based on the linearized coupled-cluster is compared with several full configuration interaction results. We also compare the results with those obtained from deterministic coupled-cluster and many-body perturbation theories.
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