Branes in L(p,q,r)

We have found the solution to the back reaction of putting a stack of coincident D3- and D5-branes in R3,1×M6, where M6 is constructed from an infinite class of Sasaki-Einstein spaces, L(p,q,r). The non-zero fluxes associated to 2-form potential suggests the presence of a non-contractible 2-cycle in this geometry. The radial part of the warp factor has the usual form and possess the cascading feature. We argue that generically the duals of these SE spaces will have irrational central charges.