  Using the AdS/CFT correspondence, we compute the spectral functions of
thermal super Yang Mills at large N_c coupled to a small number of flavours of
fundamental matter, N_f<<N_c, in the presence of a nonzero baryon density. The
holographic dual of such a theory involves the addition of probe D7-branes with
a background worldvolume gauge field switched on, embedded in the geometry of a
stack of black D3-branes. We perform the analysis in the vector and scalar
channels which become coupled for nonzero values of the spatial momentum and
baryon density. In addition, we obtain the effect of the presence of net baryon
charge on the photon production. We also extract the conductivity and find
perfect agreement with the results derived by Karch and O'Bannon in a
macroscopic setup.

High Energy Physics - Theory