Manifestly gauge invariant QED

Details Manifestly gauge invariant QED Manifestly gauge invariant QED

2005-05-18

arxiv.org/abs/hep-th/0505169v3

JHEP 0510 (2005) 115

Physics

High Energy Physics

High Energy Physics - Theory

32 pages, Diagrams Fixed; version published in JHEP

Scientific paper

10.1088/1126-6708/2005/10/115

We uncover a method of calculation that proceeds at every step without fixing the gauge or specifying details of the regularisation scheme. Results are obtained by iterated use of integration by parts and gauge invariance identities. Calculations can be performed almost entirely diagrammatically. The method is formulated within the framework of an exact renormalisation group for QED. We demonstrate the technique with a calculation of the one-loop beta function, achieving a manifestly universal result, and without gauge fixing.

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