110 citations · 485 across the 58 of their papers we have counts for
58 papers
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…
Complex Covariance
F. Kleefeld
According to some generalized correspondence principle the classical limit of a non-Hermitian Quantum theory describing quantum degrees of freedom is expected to be well known clas…
The construction of a general inner product in non-Hermitian quantum theory and some explanation for the nonuniqueness of the C operator in PT quantum mechanics
F. Kleefeld
Most recently it has been observed e.g. by Bender and Klevansky (arXiv:0905.4673 [hep-th]) that the C-operator related to a PT-symmetric non-Hermitian Hamilton operator is not uniq…
Comment on "Two-photon decay of the sigma meson"
Eef van Beveren, Frieder Kleefeld, George Rupp +1
We comment on a recent paper by Giacosa, Gutsche, and Lyobovitskij, in which it is argued that a quarkonium interpretation of the meson should give rise to a much smaller two-p…