Zobrazeno 1 - 10
of 62
pro vyhledávání: '"Kleefeld, Frieder"'
On the equivalence of the Pais-Uhlenbeck oscillator model and two non-Hermitian Harmonic Oscillators
Autor:
Kleefeld, Frieder
A system of two independent Bosonic Harmonic Oscillators is converted into the respective fourth-order derivative Pais-Uhlenbeck oscillator model. The conversion procedure displays transparently how the quantization of the fourth-order derivative Pai
Externí odkaz:
http://arxiv.org/abs/2302.14621
Autor:
Kleefeld, Frieder
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 matrices. It is investigated how a permutation of the eigen-values of t
Externí odkaz:
http://arxiv.org/abs/2102.08182
Autor:
Kleefeld, Frieder
The descripition of in a Hermitian setting seemingly nonlocal and nonperturbative phenomena like confinement or superconductivity is most conveniently performed by generalizing quantum theory to a non-Hermitian regime where these phenomena appear per
Externí odkaz:
http://arxiv.org/abs/1501.01547
Publikováno v:
Phys.Rev.D79:098501,2009
We comment on a recent paper by Giacosa, Gutsche, and Lyobovitskij, in which it is argued that a quarkonium interpretation of the $\sigma$ meson should give rise to a much smaller two-photon decay width than commonly assumed. The reason for this clai
Externí odkaz:
http://arxiv.org/abs/0811.2589
Publikováno v:
AIPConf.Proc.892:293-296,2007
Light constituent quark masses and the corresponding dynamical quark masses are determined by data, the quark-level linear sigma model, and infrared QCD. This allows to define effective nonstrange and strange current quark masses, which reproduce the
Externí odkaz:
http://arxiv.org/abs/hep-ph/0611084
The contribution of strange sea quarks to the proton mass and spin, as well as the related pion-nucleon sigma term, are briefly revisited, in the light of new experimental and lattice results. Also the predictions of chiral perturbation theory for th
Externí odkaz:
http://arxiv.org/abs/hep-ph/0609024
Chiral symmetry breaking (ChSB) is reviewed to some extent within the quark-level-linear-sigma-model (QLL$\sigma$M) theory and standard chiral perturbation theory (ChPT). It is shown, on the basis of several examples related to the pion, as a well-kn
Externí odkaz:
http://arxiv.org/abs/hep-ph/0601196
Publikováno v:
AIPConf.Proc.814:143-152,2006
We do meson spectroscopy by studying the behavior of S-matrix poles in the complex-energy plane, as a function of the coupling strength for triplet-P-zero quark-pair creation. Thereto, a general formula for non-exotic hadron-hadron scattering involvi
Externí odkaz:
http://arxiv.org/abs/hep-ph/0510120
Publikováno v:
Phys.Rev.D74:037501,2006
Pole trajectories connecting light and heavy scalar mesons, both broad resonances and quasi-bound states, are computed employing a simple coupled-channel model. Instead of varying the coupling constant as in previous work, quark and meson masses are
Externí odkaz:
http://arxiv.org/abs/hep-ph/0509351
Publikováno v:
Eur. J. Phys. 27 (2006) 337-346
We describe light-reflection properties of spherically curved mirrors, like balls in the Christmas tree. In particular, we study the position of the image which is formed somewhere beyond the surface of a spherical mirror, when an eye observes the im
Externí odkaz:
http://arxiv.org/abs/physics/0503069