Large-N Pion-Pion scattering, finite temperature effects and chiral symmetry restoration

The main focus of this thesis is to study QCD vacuum phenomena such as Chiral Symmetry Restoration (CSR) and generation of Bound States and Resonances; we attain this by analyzing two large N QCD-like models such as the nonlinear sigma model for a large number of flavors, and AdS/QCD nonconformal ap...