Brane-bulk duality and non-conformal gauge theories

We discuss non-conformal gauge theories from type-IIB D3-branes embedded in orbifolded space-times. Such theories can be obtained by allowing some non -vanishing logarithmic twisted tadpoles. In certain cases with N = 0,1 supe rsymmetry correlation functions in the planar limit are the same as in the parent N = 2 supersymmetric theories. In particular, the effective action i n such theories perturbatively is not renormalized beyond one loop in the p lanar limit. In the N = 2 as well as such N = 0,1 theories quantum correcti ons in the D3-brane gauge theories are encoded in the corresponding classic al higher dimensional field theories whose actions contain the twisted fiel ds with non-vanishing tadpoles. We argue that this duality can be extended to the non-perturbative level in the N = 2 theories. We give some evidence that this might also be the case for N = 0,1 theories as well.