Abstract
Recently two variational strategies have been applied to the standard and linear expansions for quantum field theories. These strategies, both of which improve the accuracy of the expansions, have the property that for self-interacting fields at large the lowest-order expansion improved by the variational strategy gives the exact large- result. In this article, we study, in the context of supersymmetric quantum mechanics, the numerical accuracy of the improved expansions when calculated to large order in and compare them with the accuracy of the large- expansion. We find that the usual expansion is the most accurate, followed by the linear expansion. The large- expansion, analytically continued to , is the least accurate method of the three.
- Received 31 January 1991
DOI:https://doi.org/10.1103/PhysRevD.43.3396
©1991 American Physical Society