Selected issues on justification of holographic approach to QCD

Abstract

Some problems with theoretical foundations of bottom-up holographic models are briefly discussed. It is pointed out that the spectroscopic aspects of these models in principle do not require the AdS/CFT prescriptions and may be interpreted as just an alternative language expressing the phenomenology of QCD sum rules in the large-Nc limit. A general recipe for incorporation of the chiral symmetry breaking scale into the soft-wall holographic models is proposed.