Toward a systematic holographic QCD: a braneless approach

Recently a holographic model of hadrons motivated by AdS/CFT has beenproposed to fit the low energy data of mesons. We point out that the infraredphysics can be developed in a more systematic manner by exploiting backreactionof the nonperturbative condensates. We show that these condensates cannaturally provide the IR cutoff corresponding to confinement, thus removingsome of the ambiguities from the original formulation of the model. We alsoshow how asymptotic freedom can be incorporated into the theory, and thesubstantial effect it has on the glueball spectrum and gluon condensate of thetheory. A simple reinterpretation of the holographic scale results in anon-perturbative running for alpha_s which remains finite for all energies. Wealso find the leading effects of adding the higher condensate into the theory.The difficulties for such models to reproduce the proper Regge physics lead usto speculate about extensions of our model incorporating tachyon condensation.Comment: 27 pages, LaTe