Is the quantum $n$-body problem as difficult as the classical $n$-body problem?
Or quantum mechanics allows to get a simpler exact solution?
Suppose there are 3 particles with uniform potential field. Can their wave functions be found exactly?
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The quantum $n$-body problem is considerably simpler than the classical $n$-body problem, since the problems with collisions disappear. Rigorous existence results are much stronger. See, e.g., the book ''Scattering theory of classical and quantum N-particle systems'' by Derezinski and Gérard. But explicit solutions are about as rare in the quantum case as in the classical case. |
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