91 Chapter 4: Fluctuations in Jet Tomography Figure 4.1: The suppression factor, R$_{AA}$ ( p$_{⊥}$ ) , for non-photonic electrons from the decays of quenched heavy quark (c+b) jets is compared to Phenix [237, 238] and preliminary STAR data [239, 240] data in central Au+Au reactions at 200 AGeV. Shaded bars indicate systematic errors, while thin error lines indicate statistical ones. All calculations assume initial dN$_{g}$/dy = 1000 . The upper yellow band from [374] takes into account radiative energy loss only, using a fixed L = 6 fm; the lower yellow band is our new prediction, including both elastic and inelastic losses as well as jet path length fluctuations. The bands provide an estimate of current theoretical uncertainties. The dashed curve shows the electron suppression using inelastic and TG elastic loss with bottom quark jets neglected. The observed “perfect fluidity” [77, 85–87, 375] of the sQGP at long wave- lengths ( p$_{T}$ < 2 GeV/c) provides direct evidence for highly nonperturbative dynamics leading to rapid equilibration and PdV work consistent with the