| Abstract: | Two theories that turn out to be equivalent after a transformation in their parameter space are said to be dual. However, this duality might fail when introducing background fields for other symmetries. In such cases, we say the duality is obstructed by an anomaly in the space of couplings. In this seminar, using dimensional reduction techniques, we'll show that a broad class of 2d and 4d superconformal field theories exhibits a universal anomaly in their space of exactly marginal couplings expanding the previously known results for 4d N=2 theories |