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Symmetries of three harmonically trapped particles in one dimension

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PHYSICAL REVIEW A
卷 86, 期 5, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.86.052122

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We present a method for solving few-body problems for trapped particles and apply it to three equal-mass particles in a one-dimensional harmonic trap, interacting via a contact potential. By expressing the relative Hamiltonian in Jacobi cylindrical coordinates, i.e., the two-dimensional version of three- body hyperspherical coordinates, we discover an underlying C-6v symmetry. This symmetry simplifies the calculation of energy eigenstates of the full Hamiltonian in a truncated Hilbert space constructed from the trap Hamiltonian eigenstates. Particle superselection rules are implemented by choosing the relevant representations of C-6v. We find that the one-dimensional system shows nearly the full richness of the three-dimensional system, and can be used to understand separability and reducibility in this system and in standard few-body approximation techniques.

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