Conformality at large number of fermion flavors and composite Higgs

Abstract

The many open questions concerning the existence of IR and UV fixed points in gauge theories as a function of the number of fermion flavors and bare coupling are briefly reviewed and discussed. It is pointed out that only a small subset of potential IR-conformal gauge theories, i.e. theories whose IR behavior is determined by an IR fixed point, has so far been examined. It is suggested that the naturally light scalar composites that seem to appear generically as lowest states in the non-QCD-like spectrum of such theories provide a natural basis for composite Higgs models, where the composite Higgs is not a NG boson and some of the usual fine-tuning problems are evaded.