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Chemical non-equilibrium and viscosity at the early stages of heavy ion collisions
In this talk I would like to discuss the implications of possible high values of shear viscosity of chemically non-equilibrated quark-gluon plasma (QGP) formed in the relativistic heavy-ion collisions at high energies. I analyse some temperature dependent $\eta/s$ values used in literature, using relativistic second-order dissipative hydrodynamics to discuss the chemical equilibration, as well as its effect on formation of negative pressure areas while expansion, known as cavitations. I also propose a possible way of bounding the QGP shear viscosity values at high energies using using cavitations.