Abstract
The failure of conventional perturbation theory due to secularity is considered with renormalization-group tecniques in two operator problems. Specifically, some results concerning the quantum anharmonic oscillator and quantum parametric resonance are obtained with a rather modest effort in comparison to other methods.
- Received 18 November 1996
DOI:https://doi.org/10.1103/PhysRevA.57.1586
©1998 American Physical Society