Medium-Enhanced cc[over ¯] Radiation.

We show that the same QCD formalism that accounts for the suppression of high-p_{T} hadron and jet spectra in heavy-ion collisions predicts medium-enhanced production of cc[over ¯] pairs in jets. We demonstrate that this phenomenon, which cannot be accessed by traditional jet-quenching observables, can be directly observed using D^{0}D[over ¯]^{0}-tagged jets in nuclear collisions.

Sorting Out Quenched Jets.

We introduce a new "quantile" analysis strategy to study the modification of jets as they traverse through a droplet of quark-gluon plasma. To date, most jet modification studies have been based on comparing the jet properties measured in heavy-ion collisions to a proton-proton baseline at the same reconstructed jet transverse momentum (p_{T}). It is well known, however, that the quenching of jets from their interaction with the medium leads to a migration of jets from higher to lower p_{T}, making it challenging to directly infer the degree and mechanism of jet energy loss. Our proposed quantile matching procedure is inspired by (but not reliant on) the approximate monotonicity of energy loss in the jet p_{T}. In this strategy, jets in heavy-ion collisions ordered by p_{T} are viewed as modified versions of the same number of highest-energy jets in proton-proton collisions, and the fractional energy loss as a function of jet p_{T} is a natural observable (Q_{AA}). Furthermore, despite nonmonotonic fluctuations in the energy loss, we use an event generator to validate the strong correlation between the p_{T} of the parton that initiates a heavy-ion jet and the p_{T} of the vacuum jet which corresponds to it via the quantile procedure (p_{T}^{quant}). We demonstrate that this strategy both provides a complementary way to study jet modification and mitigates the effect of p_{T} migration in heavy-ion collisions.

Nonhydrodynamic Transport in Trapped Unitary Fermi Gases.

Many strongly coupled fluids are known to share similar hydrodynamic transport properties. In this work we argue that this similarity could extend beyond hydrodynamics to transient dynamics through the presence of nonhydrodynamic modes. We review nonhydrodynamic modes in kinetic theory and gauge-gravity duality and discuss their signatures in trapped Fermi gases close to unitarity. Reanalyzing previously published experimental data we find hints of nonhydrodynamic modes in cold Fermi gases in two and three dimensions.