8 papers
Bremsstrahlung from dense plasmas and the Landau-Pomeranchuk-Migdal effect
C. Fortmann, H. Reinholz, G. Roepke +1
The suppression of the bremsstrahlung cross section due to multiple scattering of the emitting electrons is an important effect in dense media (Landau-Pomeranchuk-Migdal effect). H…
Kinetic theory of QED plasmas in a strong electromagnetic field. II. The mean-field description
A. Hoell, V. Morozov, G. Roepke
Starting from a general relativistic kinetic equation, a self-consistent mean-field equation for fermions is derived within a covariant density matrix approach of QED plasmas in st…
Kinetic theory of QED plasma in a strong electromagnetic field I. The covariant hyperplane formalism
A. Hoell, V. G. Morozov, G. Roepke
We develop a covariant density matrix approach to kinetic theory of QED plasmas subjected into a strong external electromagnetic field. A canonical quantization of the system on sp…
Topological invariant variables in QCD
D. Blaschke, V. Pervushin, G. Roepke
We show that the class of functions of topologically nontrivial gauge transformations in QCD includes a zero-mode of the Gauss law constraint. The equivalent unconstrained system c…
Anomalous anharmonicity in doped cuprate superconductors
V. Rzhevskii, G. Roepke
Strong nonlinear elastic effects arise due to the Lifshitz transition associated with a change in the Fermi surface topology. It is shown that an electronic contribution to the ela…
Topological gauge invariant variables in QCD
D. Blaschke, V. N. Pervushin, G. Roepke
We suggest that proper variables for the description of non-Abelian theories are those gauge invariant ones which keep the invariance of the winding number functional with respect…