  We construct backreacted D3/D7 supergravity backgrounds which are dual to
four-dimensional N=1 and N=2 supersymmetric Yang-Mills at large N_c with flavor
quarks in the fundamental representation of SU(N_c). We take into account the
backreaction of D7-branes on either AdS(5) x S(5) or AdS(5) x T^{1,1}, or more
generically on backgrounds where the space transverse to the D3-branes is
Kaehler. The construction of the backreacted geometry splits into two stages.
First we determine the modification of the six-dimensional space transverse to
the D3 due to the D7, and then we compute the warp factor due to the D3.
  The N=2 background corresponds to placing a single stack of N_f D7-branes in
AdS(5) x S(5). Here the Kaehler potential is known exactly, while the warp
factor is obtained in certain limits as a perturbative expansion. By placing
another D7'probe in the backreacted D3/D7 background, we derive the effect of
the D7-branes on the spectrum of the scalar fluctuations to first order in N_f.
The two systems with N=1 supersymmetry that we discuss are D3/D7/D7' and D3/D7
on the conifold. In both cases, the Kaehler potential is obtained
perturbatively in the number of D7-branes. We provide all the ingredients
necessary for the computation of each term in the expansion, and in each case
give the first few terms explicitly. Finally, we comment on some aspects of the
dual gauge theories.

High Energy Physics - Theory