Exact Ground State of Several N-body Problems With an N-body Potential

Abstract

I consider several N-body problems for which exact (bosonic) ground state and a class of excited states are known in case the N-bodies are also interacting via harmonic oscillator potential. I show that for all these problems the exact (bosonic) ground state and a class of excited states can also be obtained in case they interact via an N-body potential of the form $-e^2/\sqrt{\sumr^2_i}$ (or $-e^2/\sqrt{{\sum }_{i<j}(r_i-r_j{)}^2}$). Based on these and previously known examples, I conjecture that whenever an N-body problem is solvable in case the N-bodies are interacting via an oscillator potential, the same problem is also solvable in case they are interacting via the N-body potential. Based on several examples, I also conjecture that in either case one can always add an N-body potential of the form ${\beta }^2/{\sum }_i{r}_i^2$ and the problem is still solvable except that the degeneracy in the bound state spectrum is now much reduced.

32 pages, No figure

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Cited by in corpus (2)

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