Variational Perturbation Theory for Density Matrices

Details Variational Perturbation Theory for Density Matrices Variational Perturbation Theory for Density Matrices

1998-12-22

arxiv.org/abs/quant-ph/9812063v1

Physics

Quantum Physics

Author Information under http://www.physik.fu-berlin.de/~kleinert/institution.html . Latest update of paper also at http:/

Scientific paper

10.1103/PhysRevA.60.3429

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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