73 Chapter 2: Motivation simply too small. Recent work has surprisingly shown that the observable con- sequences from the so-called ‘neck’ region, the bulk plasma trailing behind the quark jet, are qualitatively different for thermodynamic sources from pQCD and from AdS/CFT [354]; see Fig. 2.16. Figure 2.16: The away side correlation functions of particles produced by Cooper- Frye hadronization associated with a high- p$_{T}$ jet propagating through a thermalized bulk plasma. The hydrodynamic source on the left comes from pQCD calculations [355]; the right from AdS/CFT [340]. Figure adapted from [354]. 2.4 Outline of Thesis In the next chapter a simultaneous qualitative description of intermediate- p$_{T}$ R$_{AA}$ ( p$_{T}$ ) and v$_{2}$ ( p$_{T}$ ) is developed predicated on a nonperturbative momentum punch at the boundary of the QGP and the vacuum. Another interesting source of this focusing of jets could come from the reduction of the Debye