From the 1 of 6k papers with an AI index.
- Centre National de la Recherche ScientifiqueFR1.8k papers
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- University of Science and Technology of ChinaCN1.4k papers
- Aix-Marseille UniversitéFR1.4k papers
- University of OklahomaUS1.4k papers
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7 papers · 1 filter
Large momentum expansion of two-loop self-energy diagrams with arbitrary masses
A. I. Davydychev, V. A. Smirnov, J. B. Tausk
For two-loop two-point diagrams with arbitrary masses, an algorithm to derive the asymptotic expansion at large external momentum squared is constructed. By using a general theorem…
Thouless number and spin diffusion in quantum Heisenberg ferromagnets
Peter Kopietz
Using an analogy between the conductivity tensor of electronic systems and the spin stiffness tensor of spin systems, we introduce the concept of the Thouless number and the…
Asymptotically exact mean field theory for the Anderson model including double occupancy
J. Holm, R. Kree, K. Schönhammer
The Anderson impurity model for finite values of the Coulomb repulsion is studied using a slave boson representation for the empty and doubly occupied -level. In order to av…
Spectral sum rules for the Tomonaga-Luttinger model
K. Schönhammer, V. Meden
In connection with recent publications we discuss spectral sum rules for the Tomonaga-Luttinger model without using the explicit result for the one-electron Green's function. They…
Antiferromagnetic symmetry breaking in the half filled Hubbard model in infinite dimensions
Peter Kopietz
We study the half filled Hubbard model on a hypercubic lattice in infinite dimensions in the presence of a staggered magnetic field. An exact Ward-identity between vertex functions…
An external approach to unitary representations
Marko Tadic
The main aim of this paper is to present the ideas which lead first to the solution of the unitarizability problem for $\GL(n)$ over nonarchimedean local fields and to the recognit…