The O(N) invariant quartic anharmonic oscillator is shown to be exactly solvable if the interaction parameter satisfies special conditions. The problem is directly related to that of a quantum double well anharmonic oscillator in an external field. A finite dimensional matrix equation for the problem is constructed explicitly, along with analytical expressions for some excited states in the system. The corresponding Niven equations for determining the polynomial solutions for the problem are given. © 2012 Chinese Physical Society and IOP Publishing Ltd.
Publication Source (Journal or Book title)
Chinese Physics Letters
Pan, F., Xie, M., Shi, C., & Draayer, J. (2012). Quasi-exactly solvable cases of the N-dimensional symmetric quartic anharmonic oscillator. Chinese Physics Letters, 29 (7) https://doi.org/10.1088/0256-307X/29/7/070304