Holographic QCD: Past, Present, and Future
  At the dawn of a new theoretical tool based on the AdS/CFT correspondence for nonperturbative aspects of quantum chromodynamics, we give an interim review on the new tool, holographic QCD, with some of its accomplishment. We try to give an A-to-Z picture of the holographic QCD, from string theory to a few selected top-down holographic QCD models with one or two physical applications in each model. We may not attempt to collect diverse results from various holographic QCD model studies. 
Youngman Kim, Ik Jae Shin, and Takuya Tsukioka
hep-ph hep-th nucl-th