2008/04/30 by Paulo E G Assis, Paulo E. G. Assis, Andreas Fring · 1 citation
Mathematics · Physics and Astronomy · #Nonlinear Waves and Solitons #Quantum Mechanics and Non-Hermitian Physics #Quantum chaos and dynamical systems #hep-th #math-ph #math.MP #quant-ph
paper · pdf · doi:10.1088/1751-8113/42/1/015203
published as J. Phys. A: Math. Theor. 42 (2009) 015203 · 27 pages
arxiv created 2008/10/20 · openalex publication_date 2008/11/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We analyse a class of non-Hermitian Hamiltonians, which can be expressed in terms of bilinear combinations of generators in the -Lie algebra or their isomorphic su (1, 1)-counterparts. The Hamiltonians are prototypes for solvable models of Lie algebraic type. Demanding a real spectrum and the existence of a well-defined metric, we systematically investigate the constraints these requirements impose on the coupling constants of the model and the parameters in the metric operator. We compute isospectral Hermitian counterparts for some of the original non-Hermitian Hamiltonians. Alternatively, we employ a generalized Bogoliubov transformation, which allows us to compute explicitly real-energy eigenvalue spectra for these type of Hamiltonians, together with their eigenstates. We compare the two approaches.