110 citations · 485 across the 58 of their papers we have counts for
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On the equivalence of the Pais-Uhlenbeck oscillator model and two non-Hermitian Harmonic Oscillators
Frieder Kleefeld
A system of two independent Bosonic Harmonic Oscillators is converted into the respective fourth-order derivative Pais-Uhlenbeck oscillator model. The conversion procedure displays…
Identification of the metric for diagonalizable (anti-)pseudo-Hermitian Hamilton operators represented by two-dimensional matrices
Frieder Kleefeld
A general strategy is provided to identify the most general metric for diagonalizable pseudo-Hermitian and anti-pseudo-Hermitian Hamilton operators represented by two-dimensional m…
Elements of a non-Hermitian quantum theory without Hermitian conjugation - scalar product and scattering
Frieder Kleefeld
The descripition of in a Hermitian setting seemingly nonlocal and nonperturbative phenomena like confinement or superconductivity is most conveniently performed by generalizing qua…
On some meaningful inner product for real Klein-Gordon fields with positive semi-definite norm
F. Kleefeld
A simple derivation of a meaningful, manifestly covariant inner product for real Klein-Gordon (KG) fields with positive semi-definite norm is provided which turns out - assuming a…
Trigonometric identities, angular Schrödinger equations and a new family of solvable models
Vit Jakubsky, Miloslav Znojil, Euclides Augusto Luis +1
Angular parts of certain solvable models are studied. We find that an extension of this class may be based on suitable trigonometric identities. The new exactly solvable Hamiltonia…