Dynamic AdS/QCD is a holographic model of strongly coupled gauge theories
with the dynamics included through the running anomalous dimension of the quark
bilinear, gamma. We apply it to describe the physics of massive quarks in the
conformal window of SU(N_c) gauge theories with N_f fundamental flavours,
assuming the perturbative two loop running for gamma. We show that to find
regular, holographic, renormalization group flows in the infra-red the
decoupling of the quark flavours at the scale of the mass is important and
enact it through suitable boundary conditions when the flavours become on
shell. We can then compute the quark condensate and the mesonic spectrum
(M_rho, M_pi, M_sigma) and decay constants. We compute their scaling dependence
on the quark mass for a number of examples. The model matches perturbative
expectations for large quark mass and naive dimensional analysis (including the
anomalous dimensions) for small quark mass. The model allows study of the
intermediate regime where there is an additional scale from the running of the
coupling and we present results for the deviation of scalings from assuming
only the single scale of the mass.Comment: 12 pages, 26 figures, new references adde
