Abstract
We calculate the one loop beta functions of nonlinear sigma models in four dimensions containing general two- and four-derivative terms. In the model there are four such terms and nontrivial fixed points exist for all . In the chiral models there are in general six couplings, but only five for and four for ; we find fixed points only for , 3. In the approximation considered, the four-derivative couplings are asymptotically free but the coupling in the two-derivative term has a nonzero limit. These results support the hypothesis that certain sigma models may be asymptotically safe.
- Received 14 December 2009
DOI:https://doi.org/10.1103/PhysRevD.81.065012
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