2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/223630We use low-energy effective description of gauge theory/string theory duality to argue that the Kovtun-Son-Starinets viscosity bound is generically violated in superconformal gauge theories with non-equal central charges $c\ne a$. We present new examples (of string theory constructions and of gauge theories) where the bound is violated in a controllable setting. We consider the comparison of results from AdS/CFT calculations to the QCD plasma in the context of this discussion.44 pages, v2: Minor changes to numerics in section 4, references added, v3: published versionHigh Energy Physics - Theorytext