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Cairns Topical Workshop on Light-Cone QCD and Nonperturbative Hadron Physics, Cairn : Australie (2005)
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UV and IR behaviour in QFT and LCQFT with fields as Operator Valued Distributions:Epstein and Glaser revisited.
Pierre Ca Grange1, Ernst Werner2

Following Epstein-Glaser's work we show how a QFT formulation based on operator valued distributions (OPVD) with adequate test functions treats original singularities of propagators on the diagonal in a mathematically rigourous way.Thereby UV and/or IR divergences are avoided at any stage, only a finite renormalization finally occurs at a point related to the arbitrary scale present in the test functions.Some well known UV cases are examplified.The power of the IR treatment is shown for the free massive scalar field theory developed in the (conventionally hopeless) mass perturbation expansion.It is argued that the approach should prove most useful for non pertubative methods where the usual determination of counterterms is elusive
1 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
2 :  INSTITUT FUR THEORETISCHE PHYSIK - Institut fur Theoretische Physik , D93040,Universitat Regensburg,Germany.
Physique/Physique mathématique

Mathématiques/Physique mathématique
Quantum Field Theory – Renormalization – Light Cone
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