Essential spectrum of a family of 3 × 3 operator matrices: Location of the branches.

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    • Abstract:
      In the article we have considered a family A (K), K ∈ Td : = (— π; π]d of operator matrices of order three. They arise in the spectral analysis problem of the so called lattice truncated spin-boson Hamiltonian with at most two bosons. The position and structure of two-particle as well three-particle branches (subsets) of σess(A (K)) are investigated. [ABSTRACT FROM AUTHOR]
    • Abstract:
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