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- W3102276936 abstract "We consider a quantum mechanical three-particle system made of two identical fermions of mass one and a different particle of mass m, where each fermion interacts via a zero-range force with the different particle. In particular we study the unitary regime, i.e., the case of infinite two-body scattering length. The Hamiltonians describing the system are, by definition, self-adjoint extensions of the free Hamiltonian restricted on smooth functions vanishing at the two-body coincidence planes, i.e., where the positions of two interacting particles coincide. It is known that for m larger than a critical value m ∗ ≃ (13.607)−1 a self-adjoint and lower bounded Hamiltonian H 0 can be constructed, whose domain is characterized in terms of the standard point-interaction boundary condition at each coincidence plane. Here we prove that for m ∈ (m ∗,m ∗∗), where m ∗∗ ≃ (8.62)−1, there is a further family of self-adjoint and lower bounded Hamiltonians H 0,β , β ∈ ℝ, describing the system. Using a quadratic form method, we give a rigorous construction of such Hamiltonians and we show that the elements of their domains satisfy a further boundary condition, characterizing the singular behavior when the positions of all the three particles coincide." @default.
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- W3102276936 date "2015-12-01" @default.
- W3102276936 modified "2023-10-16" @default.
- W3102276936 title "A Class of Hamiltonians for a Three-Particle Fermionic System at Unitarity" @default.
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- W3102276936 doi "https://doi.org/10.1007/s11040-015-9195-4" @default.
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