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We consider an effective field theory description of beyond-quasi-particleexcitations aiming to associate the transport properties of the system with thespectral density of states. Tuning various properties of the many-particlecorrelations, we investigate how the robust microscopic features are translatedinto the macroscopic observables like shear viscosity and entropy density. Theliquid-gas crossover is analysed using several examples. A thermal constrainton the fluidity measure, the ratio of shear viscosity to entropy density, isdiscussed.

Shear viscosity over entropy density ratio with extended quasi-particles