123 citations · 363 across the 10 of their papers we have counts for
10 papers
Diphoton decay of the higgs from the Epstein--Glaser viewpoint
Pawel Duch, Michael Duetsch, Jose M. Gracia-Bondia
We revisit a nearly ten-year old controversy on the diphoton decay of the Higgs particle. To a large extent, the controversy turned around the respective merits of the regularizati…
The Master Ward Identity for scalar QED
Michael Dütsch, Luis Peters, Karl-Henning Rehren
It is emphasized that for interactions with derivative couplings, the Ward Identity (WI) securing the preservation of a global U(1) symmetry should be modified. Scalar QED is taken…
The Master Ward Identity and Generalized Schwinger-Dyson Equation in Classical Field Theory
Michael Duetsch, Klaus Fredenhagen
In the framework of perturbative quantum field theory a new, universal renormalization condition (called Master Ward Identity) was recently proposed by one of us (M.D.) in a joint…
A comment on the dual field in the AdS-CFT correspondence
M. Duetsch, K. -H. Rehren
In the perturbative AdS-CFT correspondence, the dual field whose source are the prescribed boundary values of a bulk field in the functional integral, and the boundary limit of the…
Algebraic Quantum Field Theory, Perturbation Theory, and the Loop Expansion
M. Duetsch, K. Fredenhagen
The perturbative treatment of quantum field theory is formulated within the framework of algebraic quantum field theory. We show that the algebra of interacting fields is additive,…
Deformation stability of BRST-quantization
M. Duetsch, K. Fredenhagen
To avoid the problems which are connected with the long distance behavior of perturbative gauge theories we present a local construction of the observables which does not involve t…
A local (perturbative) construction of observables in gauge theories: the example of QED
M. Duetsch, K. Fredenhagen
Interacting fields can be constructed as formal power series in the framework of causal perturbation theory. The local field algebra is obtained without…
On Gauge Invariance and Spontaneous Symmetry Breaking
Andreas Aste, Michael D"utsch, G"unter Scharf
We show how the widely used concept of spontaneous symmetry breaking can be explained in causal perturbation theory by introducing a perturbative version of quantum gauge invarianc…
Perturbative gauge invariance: the electroweak theory
Michael Dutsch, Gunter Scharf
The concept of perturbative gauge invariance formulated exclusively by means of asymptotic fields is generalized to massive gauge fields. Applying it to the electroweak theory lead…
Gauge invariance of massless QED
Michael Duetsch, Tobias Hurth, Guenter Scharf
A simple general proof of gauge invariance in QED is given in the framework of causal perturbation theory. It illustrates a method which can also be used in non-abelian gauge theor…