Convergence of the optimized δ expansion for the connected vacuum amplitude: Anharmonic oscillator
- 15 September 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 52 (6) , 3704-3711
- https://doi.org/10.1103/physrevd.52.3704
Abstract
The convergence of the linear δ expansion for the connected generating functional of the quantum anharmonic oscillator is proved. Using an order-dependent scaling for the variational parameter λ, we show that the expansion converges to the exact result with an error bounded by Aexp(-).
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