Conformal phase transitions at weak and strong coupling Original Research Article

D3 and D7-branes intersecting in image dimensions give rise at low energies to image supersymmetric Yang–Mills theory coupled to defect fermions in the fundamental representation. This theory undergoes a phase transition from a conformal phase to one in which the fermions acquire a non-zero mass when the ʼt Hooft coupling of the image SYM exceeds a critical value. To study this transition, we continue the parameters of the model to a regime where a gravitational description is valid. We use it to calculate the masses of mesons and the phase diagram as a function of temperature and chemical potential. We also comment on the relation of our discussion to the transition from the non-abelian Coulomb phase to a confining one believed to occur in QCD at a critical number of flavors.