The most important single attribute of noncovariant gauges is their ghost-free nature.
Although noncovariant gauges have been an integral part of quantum field theory for many …

Starting from the observation that colour charge is only well defined on gauge invariant
states, we construct perturbatively gauge invariant, dynamical dressings for individual …

It has been known since the earliest days of quantum field theory (QFT) that infrared
divergences arise in scattering theory with massless fields. These infrared divergences are …

Quantum Field Theory (QFT) has proved to be the most useful strategy for the description of
elementary particle interactions and as such is regarded as a fundamental part of modern …

On the one hand, perturbative quantum field theory (pQFT) is very successful: The results
obtained by computing the lowest orders of the perturbation series are in good agreement …

Interacting fields can be constructed as formal power series in the framework of causal
perturbation theory. The local field algebra is obtained without performing the adiabatic limit; …

A bstract A non-perturbative and exactly solvable quantum field theoretical model for a
“dressed Dirac field” is presented, that exhibits all the kinematical features of QED: an …

Gauge theories possess nonlocal features that, in the presence of boundaries, inevitably
lead to subtleties. We employ geometric methods rooted in the functional geometry of the …

A new approach to the analysis of the physical state space of a theory is presented within
the general setting of local quantum physics. It also covers theories with long range forces …

Some of the most effective gauges in field theory are noncovariant gauges of the axial kind,
such as the light-cone gauge and the temporal gauge. The principal advantage of these …