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hep-th2000
The Hopf Algebra Structure of Connes and Kreimer in Epstein-Glaser Renormalization
G. Pinter
We show how the Hopf algebra structure of renormalization discovered by Kreimer can be found in the Epstein-Glaser framework without using an analogue of the forest formula of Zimm…
hep-th1999
Lorentz Invariant Renormalization in Causal Perturbation Theory
K. Bresser, G. Pinter, D. Prange
In the framework of causal perturbation theory renormalization consists of the extension of distributions. We give the explicit form of a Lorentz invariant extension of a scalar di…