Conformal or confining -- results from lattice gauge theory for higher-representation gauge theories
arXiv:1301.1877
Abstract
We have calculated the running coupling in SU(2), SU(3), and SU(4) gauge theories to see whether they have infrared fixed points. An infrared fixed point means no confinement: It means that the long-distance physics is conformal, without a mass scale and indeed without a particle spectrum. All these theories run slowly in perturbation theory, so a nonperturbative determination is interesting.
arXiv comment8 pages, 8 figures, talk given at Quark Confinement and the Hadron Spectrum X, Munich, October 2012
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