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quant-ph1996★ 20 cited
Resummation of anisotropic quartic oscillator. Crossover from anisotropic to isotropic large-order behavior
H. Kleinert, S. Thoms
We present an approximative calculation of the ground-state energy for the anisotropic anharmonic oscillator Using an instanton solution of the isotropic action , we obtain t…
quant-ph1995★ 63 cited
Convergence behavior of variational perturbation expansion-- A method for locating Bender-Wu singularities
H. Kleinert, W. Janke
Variational perturbation expansions have recently been used to calculate directly the strong-coupling expansion coefficients of the anharmonic oscillator. The convergence is expone…