Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-05-15
Annals Phys. 249 (1996) 109-145
Physics
High Energy Physics
High Energy Physics - Theory
some bugs of uuencoded postscript figures are fixed
Scientific paper
10.1006/aphy.1996.0066
We improve and generalize in several accounts the recent rigorous proof of convergence of delta expansion - order dependent mappings (variational perturbation expansion) for the energy eigenvalues of anharmonic oscillator. For the single-well anharmonic oscillator the uniformity of convergence in $g\in[0,\infty]$ is proven. The convergence proof is extended also to complex values of $g$ lying on a wide domain of the Riemann surface of $E(g)$. Via the scaling relation \`a la Symanzik, this proves the convergence of delta expansion for the double well in the strong coupling regime (where the standard perturbation series is non Borel summable), as well as for the complex ``energy eigenvalues'' in certain metastable potentials. Sufficient conditions for the convergence of delta expansion are summarized in the form of three theorems, which should apply to a wide class of quantum mechanical and higher dimensional field theoretic systems.
Guida Riccardo
Konishi Kenichi
Suzuki Hiroshi
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