148 Chapter 7: Conclusions and Outlook tum dependence of heavy quarks. Specifically at Lhc dR c,b $_{AA}$/dp$_{T}$ > 0 implies perturbative loss whereas dR c,b $_{AA}$/dp$_{T}$ < 0 implies AdS/CFT drag loss. While the substantial suppression of heavy quarks at$_{Lhc}$ predicted by some models could make this difficult to see experimentally the ratio of the two nuclear mod- ification factors, R $^{cb}$( p$_{T}$ ) = R c $_{AA}$( p$_{T}$ ) /R b $_{AA}$( p$_{T}$ ) is extremely robust to changes in the theoretical input parameters. Perturbative predictions take R cb → 1 for large momenta while the double ratio is momentum independent and signif- icantly below one, ∼ . 2, from AdS/CFT drag. The only issue is the regions of self-consistent applicability of the two approaches. pQCD is valid at large momenta, but the momentum below which its approximations begin to break down is not quantitatively known. On the other hand AdS/CFT drag is valid at small momenta, but the momentum above which its approximations be- gin to break down is not quantitatively known. It is likely that for bottom quarks there is a momentum range for which both are applicable; for charm it is less clear. In this sense the p$_{T}$ behavior of the R cb ratio may indicate either the falsification of one or both sets or ideas or may simply give an experi- mental indication of these aforementioned momentum cutoffs. Predictions for $_{Rhic}$, where the lower multiplicity will increase the momentum cutoff from the AdS/CFT drag derivation, were given. Continuing to pursue qualitatively different predictions from energy loss formalisms we began to investigate heavy quark photon bremsstrahlung. Even the intermediate results from production radiation were quite interesting: in- cluding the interference terms from the away-side quark jet filled in the radia-