Physics – Mathematical Physics
Scientific paper
2005-10-14
Nucl.Phys.Proc.Suppl.161:75-80,2006
Physics
Mathematical Physics
6 pages 2 columns per page
Scientific paper
10.1016/j.nuclphysbps.2006.08.00
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
Grange Pierre Ca
Werner Ernst
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