Supergravity and large-N noncommutative field theories

We consider systems of Dp-branes in the presence of a nonzero B field. We s tudy the corresponding supergravity solutions in the limit where the branes worldvolume theories decouple from gravity. These provide dual description s of large N noncommutative field theories. We analyse the phase structure of the theories and the validity of the different description. We provide e vidence that in the presence of a nonzero B field the worldvolume theory of D6 branes may decouple from gravity. We analyse the systems of M5 branes a nd NS5 branes in the presence of a nonzero C field and nonzero RR fields, r espectively. Finally, we study the Wilson loops (surfaces) using the dual d escriptions.