repulsive core has been studied using the AdS/CFT correspondence \[13-16\] and an explicit expression has been obtained for the repulsive core.

Also, there are many attempts to find a geometry dual to nucleus. Since nucleons are described by D-branes wrapping a sphere in curved geometry of holographic QCD, on a nucleus with mass number A there appears a U(A) gauge theory. One can find the dual gravity By taking the large mass number limit $A\rightarrow\infty$ and obtained a near horizon geometry corresponding to the heavy nucleus. The corresponding supergravity solution has discrete fluctuation spectra comparable with nuclear experimental data \[17\]. As we know from the nuclear experiments, the nucleons of a heavy nuclei have coherent excitations which are called Giant resonances. These resonances exhibit harmonic behavior $E_n = n w(A)$ which is explained with phenomenological models such as the liquid drop model. The gauge-gravity duality can reproduce this behavior. Moreover, dependence to the mass number A is obtained by using the duality \[17\].

Among the holographic QCD models, the Sakai-Sugimoto (SS) \[18-19\] and Klebanov-Strassler (KS) models \[20\] are the most interesting holographic models to study strong coupling regime of QCD. The SS model is based on ten-dimensional type-IIA string theory, 