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math-ph2018★ 5 cited
Analytic eigenvalue structure of a coupled oscillator system beyond the ground state
Alexander Felski, S. P. Klevansky
By analytically continuing the eigenvalue problem of a system of two coupled harmonic oscillators in the complex coupling constant , we have found a continuation structure throu…
math-ph2017★ 11 cited
Analytic structure of eigenvalues of coupled quantum systems
Carl M. Bender, Alexander Felski, Nima Hassanpour +2
By analytically continuing the coupling constant of a coupled quantum theory, one can, at least in principle, arrive at a state whose energy is lower than the ground state of t…