4 citations · 13 across the 7 of their papers we have counts for
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hep-th2003
Quantum field theory of degenerate systems
Christian Brouder
To set up a self-consistent quantum field theory of degenerate systems, the unperturbed state should be described by a density matrix instead of a pure state. This increases the co…
hep-th2002★ 1 cited
Quantum groups and interacting quantum fields
Christian Brouder
If C is a cocommutative coalgebra, a bialgebra structure can be given to the symmetric algebra S(C). The symmetric product is twisted by a Laplace pairing and the twisted product o…
hep-th2000
Noncommutative renormalization for massless QED
Christian Brouder, Alessandra Frabetti
We study the renormalization of massless QED from the point of view of the Hopf algebra discovered by D. Kreimer. For QED, we describe a Hopf algebra of renormalization which is ne…