50 citations · 115 across the 13 of their papers we have counts for
13 papers
Electroweak form factors of large nuclei as BPS skyrmions
Alberte Xosé López Freire, Christoph Adam, Alberto García Martín-Caro +1
We employ the Bogomolnyi-Prasad-Sommerfield (BPS) Skyrme model within the framework of semi-classical quantization as an effective model to compute both the electromagnetic and neu…
Causality and radiatively induced CPT violation
C. Adam, F. R. Klinkhamer
We consider quantum electrodynamics with an additional Lorentz- and CPT-violating axial-vector term in the fermionic sector and discuss the possibility that radiative corrections i…
Covariant Schwinger terms
C. Adam, C. Ekstrand, T. Sykora
There exist two versions of the covariant Schwinger term in the literature. They only differ by a sign. However, we shall show that this is an essential difference. We shall carefu…
Zero modes in finite range magnetic fields
C. Adam, B. Muratori, C. Nash
We find a class of Fermion zero modes of Abelian Dirac operators in three dimensional Euclidean space where the gauge potentials and the related magnetic fields are nonzero only in…
Hopf instantons and the Liouville equation in target space
C. Adam, B. Muratori, C. Nash
We generalise recent results on Hopf instantons in a Chern--Simons and Fermion theory in a fixed background magnetic field. We find that these instanton solutions have to obey the…
Comment on covariant Stora--Zumino chain terms
C. Adam
In a recent paper, Ekstrand proposed a simple expression from which covariant anomaly, covariant Schwinger term and higher covariant chain terms may be computed. We comment on the…
Decay widths and scattering processes in massive QED
C. Adam
Using mass perturbation theory, we infer the bound-state spectrum of massive QED and compute some decay widths of unstable bound states. Further, we discuss scattering processe…
Consistent and covariant commutator anomalies in the chiral Schwinger model
C. Adam
We derive all covariant and consistent divergence and commutator anomalies of chiral QED within the framework of canonical quantization of the fermions. Further, we compute the…
Investigation of anomalous axial QED
C. Adam
Although axial QED suffers from a gauge anomaly, gauge invariance may be maintained by the addition of a nonlocal counterterm. Such nonlocal conterterms, however, are expected to r…
Scattering processes in the massive Schwinger model
C. Adam
We derive the (matrix-valued) Feynman rules of the mass perturbation theory and use it for the resummation of the -point functions with the help of the Dyson-Schwinger equations…
The three-boson bound state in the massive Schwinger model
C. Adam
We derive the (matrix-valued) Feynman rules of mass perturbation theory of the massive Schwinger model for non-zero vacuum angle theta. Further, we discuss the properties of the th…
Charge screening and confinement in the massive Schwinger model
C. Adam
Within the framework of Euclidean path integral and mass perturbation theory we compute the Wilson loop of widely separated external charges for the massive Schwinger model. From t…
Decay widths in the massive Schwinger model
C. Adam
By a closer inspection of the massive Schwinger model within mass perturbation theory we find that, in addition to the -boson bound states, a further type of hybrid bound states…