Variational Perturbation Theory for the Ground-State Wave Function
Axel Pelster, Florian Weissbach
Abstract
We evaluate perturbatively the density matrix in the low-temperature limit and thus the ground-state wave function of the anharmonic oscillator up to second order in the coupling constant. We then employ Kleinert's variational perturbation theory to determine the ground-state wave function for all coupling strengths.
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