Phys. Rev. A 60, 3429 - 3443 (1999)Variational perturbation theory for density matrices
Michael Bachmann, Hagen Kleinert, and Axel Pelster Received 22 December 1998 We develop a convergent variational perturbation theory for quantum-statistical density matrices which is applicable to polynomial as well as nonpolynomial interactions. We illustrate the power of the theory by calculating the temperature-dependent density of a particle in the double-well potential to second order, and of the electron in the hydrogen atom to first order. ©1999 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevA.60.3429 [ Abstract | Previous article | Next article | Issue 5 ] |
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