692 citations
- Centre National de la Recherche ScientifiqueFR283 papers
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4 papers · 1 filter
Quantum groups and quantum field theory: I. The free scalar field
Christian Brouder, Robert Oeckl
The quantum field algebra of real scalar fields is shown to be an example of infinite dimensional quantum group. The underlying Hopf algebra is the symmetric algebra S(V) and the p…
Pre-avalanche instabilities in a granular pile
Lydie Staron, Jean-Pierre Vilotte, Farhang Radjai
We investigate numerically the transition between static equilibrium and dynamic surface flow of a 2D cohesionless granular system driven by a continuous gravity loading. This tran…
Renormalization of QED in an external field
Christian Brouder
The Schwinger equations of QED are rewritten in three different ways as integral equations involving functional derivatives, which are called weak field, strong field, and SCF quan…
Microscopic Calculation of the Constitutive Relations
Christian Brouder, Stephanie Rossano
Homogenization theory is used to calculate the macroscopic dielectric constant from the quantum microscopic dielectric function in a periodic medium. The method can be used to calc…