260 citations · 2.8k across the 136 of their papers we have counts for
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quant-ph1998★ 20 cited
Variational Perturbation Theory for Density Matrices
M. Bachmann, H. Kleinert, A. Pelster
We develop convergent variational perturbation theory for quantum statistical density matrices. The theory is applicable to polynomial as well as nonpolynomial interactions. Illust…
quant-ph1998★ 23 cited
Smearing Formula for Higher-Order Effective Classical Potentials
Hagen Kleinert, Werner Kuerzinger, Axel Pelster
In the variational approach to quantum statistics, a smearing formula describes efficiently the consequences of quantum fluctuations upon an interaction potential. The result is an…