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5 papers
Superconductivity and Instabilities in the t-t' Hubbard Model
F. Wegner, V. Hankevych
We present a stability analysis of the 2D t-t' Hubbard model on a square lattice for t' = -t/6. We find possible phases of the model (d-wave Pomeranchuk and superconducting states,…
Floating Bodies of Equilibrium II
Franz Wegner
In a previous paper (physics/0203061) ''Floating bodies of equilibrium I'' I have shown that there exist two-dimensional non-circular cross-sections of bodies of homogeneous densit…
Floating Bodies of Equilibrium I
Franz Wegner
A long cylindrical body of circular cross-section and homogeneous density may float in all orientations around the cylinder axis. It is shown that there are also bodies of non-circ…
Stability Analysis of the Hubbard-Model
I. Grote, E. Koerding, F. Wegner
An effective Hartree-Fock-Bogoliubov-type interaction is calculated for the Hubbard-model in second order in the coupling by means of flow-equations. A stability analysis is perfor…
Light-cone Hamiltonian flow for positronium
Elena L. Gubankova, Hans-Christian Pauli, Franz J. Wegner +1
The technique of Hamiltonian flow equations is applied to the canonical Hamiltonian of quantum electrodynamics in the front form and 3+1 dimensions. The aim is to generate a bound…