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A strongly momentum-dependent dressed-quark mass function is basic to QCD. It is central to the appearance of a constituent-quark mass-scale and an existential prerequisite for Goldstone modes. Dyson-Schwinger equation (DSEs) studies have long emphasised this importance, and have proved that QCD’s Goldstone modes are the only pseudoscalar mesons to possess… (More)

Dyson-Schwinger equations furnish a Poincaré covariant approach to hadron physics. They reveal that dynamical chiral symmetry breaking is tied to the long-range behaviour of the strong interaction and make predictions corroborated by modern lattice-QCD simulations. A hallmark in the contemporary use of DSEs is the existence of a nonperturbative, symmetry… (More)

- Dietmar Rakowitz, Barbara Matuszczak, Stefan Gritsch, Peter Hofbauer, A. Krassnigg, Luca Costantino
- European journal of pharmaceutical sciences…
- 2002

Diphenylmethyleneaminooxycarboxylic acids were found to represent novel type inhibitors of the enzyme aldose reductase. Ester derivatives of the most active compound (3c) (IC(50)=33 microM) were prepared as potential prodrugs and the rate of degradation was studied by treatment with buffers, plasma, and various hydrolytic enzymes. Whereas all compounds were… (More)

- M. Blank, A. Krassnigg
- Computer Physics Communications
- 2011

Electron scattering at large Q probes a nucleon’s quark core. This core’s contribution to electromagnetic form factors may be calculated using Poincaré covariant Faddeev amplitudes combined with a nucleon-photon vertex that automatically fulfills a WardTakahashi identity for on-shell nucleons. The calculated behaviour of GpE(Q )/GpM(Q ) on Q ∈ [2, 6]GeV… (More)

- A. Krassnigg, Pieter Maris
- 2004

Two-body bound states such as mesons are described by solutions of the Bethe– Salpeter equation. We discuss recent results for the pseudoscalar and vector meson masses and leptonic decay constants, ranging from pions up to cc̄ bound states. Our results are in good agreement with data. Essential in these calculation is a momentum-dependent quark mass… (More)

- A. Krassnigg
- 2001

and refer to [2] and [3] for more background information. Here, M is the wanted eigenvalue of the invariant mass squared operator, with associated eigenfunction ψ ≡ Ψqq̄. It is the probability amplitude for finding in the qq̄–space a quark with the effective (constituent) mass m1, longitudinal momentum fraction x, transversal momentum ~k⊥ and helicity λ1,… (More)

- Bruno Streitmann, A. Krassnigg
- Wiener klinische Wochenschrift
- 1957

The Faddeev approach has for a long time been a very efficient tool for solving three-body problems in nuclear physics. Especially in the case of short-range forces the Faddeev equations can nowadays be solved to a high precision both for bound and scattering problems. The Faddeev theory offers a number of advantages over other approaches, such as solving… (More)

- Reinhard Alkofer, Markus J. Kloker, A. Krassnigg, Robert F. Wagenbrunn
- Physical review letters
- 2006

Phenomenological consequences of the infrared singular, instantaneous part of the gluon propagator in the Coulomb gauge are investigated. The corresponding quark Dyson-Schwinger equation is solved, neglecting retardation and transverse gluons and regulating the resulting infrared singularities. While the quark propagator vanishes as the infrared regulator… (More)