VARIATIONAL PERTURBATION THEORY FOR DENSITY MATRICES

@article{Bachmann1999VARIATIONALPT,
  title={VARIATIONAL PERTURBATION THEORY FOR DENSITY MATRICES},
  author={M. Bachmann and H. Kleinert and A. Pelster},
  journal={Physical Review A},
  year={1999},
  volume={60},
  pages={3429-3443}
}
We develop convergent variational perturbation theory for quantum statistical density matrices. The theory is applicable to polynomial as well as nonpolynomial interactions. Illustrating the power of the theory, we calculate the temperature-dependent density of a particle in a double-well and of the electron in a hydrogen atom. 
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