In this seminar I will describe a holographic approach to QCD where
conformal symmetry is broken explicitly in the UV by a relevant operator
O. This operator maps to a five dimensional scalar field, the dilaton,
with a massive term. Implementing also the IR constraint found by
Gursoy, Kiritsis and Nitti, an approximate linear glueball spectrum is
obtained which is consistent with lattice data. Finally, I will describe
the evolution of the model parameters with the conformal dimension of O.
This will suggest a map between the QCD anomaly and the trace anomaly of