Strong-coupling expansions for the \({\mathcal {PT}}\)-symmetric oscillators \(V(x)= a({\mathbf i}x)+b({\mathbf i}x)^2+ c({\mathbf i}x)^3\). (English) Zbl 0933.70018

Fernández, F. M.; Guardiola, R.; Ros, J.; Znojil, M.

J. Phys. A, Math. Gen. 31, No. 50, 10105-10112 (1998).

MSC:

70K60

General perturbation schemes for nonlinear problems in mechanics

Keywords:

relaxed hermiticity; convergence of perturbation expansions; cubic anharmonic oscillator