Abstract
We give a simple proof of the equivalence theorem, stating that two field theories related by nonlinear field transformations have the same S matrix. We are thus able to identify a subclass of nonrenormalizable field theories which are actually physically equivalent to renormalizable ones. Our strategy is to show by means of the Becchi-Rouet-Stora formalism that the “nonrenormalizable” part of such fake nonrenormalizable theories is a kind of gauge fixing, being confined in the cohomologically trivial sector of the theory.
- Received 8 December 1998
DOI:https://doi.org/10.1103/PhysRevD.59.121701
©1999 American Physical Society
