Speaker
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Transport coefficients of strongly interacting matter are currently subject of intense studies due to their relevance for the characterization of the quark-gluon plasma (QGP) produced in ultra-relativistic heavy-ion collisions (uRHIC).
We discuss the connection between the shear viscosity to entropy density ratio, $\eta/s$,
and the electric conductivity, $\sigma_{el}$: we find that a minimal eta/s is consistent with a low value of electric conductivity as measured in recent lattice QCD calculations.
More generally we show that the ratio of $\eta/s$ over $\sigma_{el}/T$ supplies a measure of the quark to gluon scattering rates whose knowledge would allow to significantly advance in the understanding of the QGP phase.
We also predict that $(\eta/s)/(\sigma_{el}/T)$, independently on the running coupling $\alpha_s(T)$, should increase up to about $\sim 20$ for $T\to T_c$, while it goes down to a nearly flat behaviour around $\simeq 4$ for $T\geq 4T_c$.
