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Small Shear Viscosity of a Quark-Gluon Plasma Implies Strong Jet Quenching
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abstract
We derive an expression relating the transport parameter $\hat{q}$ and the shear viscosity $\eta$ of a weakly coupled quark-gluon plasma. A deviation from this relation can be regarded as a quantitative measure of ``strong coupling'' of the medium. The ratio $T^3/\hat{q}$, where $T$ is the temperature, is a more broadly valid measure of the coupling strength of the medium than $\eta/s$, where $s$ denotes the entropy density. Different estimates of $\hat{q}$ derived from existing RHIC data are shown to imply radically different structures of the produced matter.
Forward citations
Cited by 2 Pith papers
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Transition from weak to strong coupling in thermal gauge theories: Lessons from ${\cal N}=4$ SYM Theory
Padé interpolation between NLO weak- and strong-coupling results places the thermal N=4 SYM transition region at 't Hooft coupling λ roughly between 3 and 14.
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What is the Quark-Gluon Plasma made of?
The quark-gluon plasma is best described as a strongly coupled liquid of massive, very short-lived quark and gluon quasiparticles, with sound (phonon) modes becoming the most well-defined collective excitation at low momenta.
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