Tests of Universality in AdS/QCD

Understand

Estimates of the light hadron masses, decay constants and couplings in AdS/QCD models are generally more accurate than should have been expected.

• Certain predictions based on the AdS/CFT correspondence, such as the ratio of the equilibrium viscosity to entropy density, are universal and therefore provide firm experimental tests of these models.
• Other observables, while not completely universal, may be relatively insensitive to model details.
• We calculate the dependence of a number of low-energy hadronic observables on details of the hard-wall AdS/QCD model.