Nonlinear Sciences – Exactly Solvable and Integrable Systems
Scientific paper
1997-08-28
Nonlinear Sciences
Exactly Solvable and Integrable Systems
15 pages in LaTeX2e (uses amsmath), misprints corrected and other small changes
Scientific paper
10.1016/S0375-9601(98)00535-0
The correspondence between the integrability of classical mechanical systems and their quantum counterparts is not a 1-1, although some close correspondencies exist. If a classical mechanical system is integrable with invariants that are polynomial in momenta one can construct a corresponding commuting set of differential operators. Here we discuss some 2- or 3-dimensional purely quantum integrable systems (the 1-dimensional counterpart is the Lame equation). That is, we have an integrable potential whose amplitude is not free but rather proportional to $\hbar^2$, and in the classical limit the potential vanishes. Furthermore it turns out that some of these systems actually have N+1 commuting differential operators, connected by a nontrivial algebraic relation. Some of them have been discussed recently by A.P. Veselov et. al.} from the point of view of Baker-Akheizer functions.
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