Abstract
Two generalizations of Kempf's quadratic canonical commutation relation in one dimension are considered. The first one is the most general quadratic commutation relation. The corresponding nonzero minimal uncertainties in position and momentum are determined and the effect on the energy spectrum and eigenfunctions of the harmonic oscillator in an electric field is studied. The second extension is a function-dependent generalization of the simplest quadratic commutation relation with only a nonzero minimal uncertainty in po- sition. Such an uncertainty now becomes dependent on the average position. With each function-dependent commutation relation we associate a family of potentials whose spectrum can be exactly determined through supersymmetric quantum mechanical and shape invari- ance techniques. Some representations of the generalized Heisenberg algebras are proposed in terms of conventional position and momentum operatorsx, p. The resulting Hamiltonians contain a contribution proportional to p 4 and their p-dependent terms may also be functions
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