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Paper detail

Asymptotic safety and the gauged SU(N) nonlinear sigma-model

We study the beta functions of the leading, two-derivative terms of the left-gauged SU(N) nonlinear sigma-model in d dimensions. In d>2, we find the usual Gaussian ultraviolet fixed point for the gauge coupling and an attractive non-Gaussian fixed point for the Goldstone boson coupling. The position of the latter fixed point controls the chiral expansion, unitarity and the strength of the tree-level Goldstone boson scattering amplitudes. Attention is paid to the gauge- and scheme-dependence of the results.

preprint2011arXivOpen access
M. FabbrichesiR. PercacciA. ToneroO. Zanusso
hep-phhep-th
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M. FabbrichesiR. PercacciA. ToneroO. Zanusso

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