Ratio of shear viscosity to entropy density in multifragmentation of Au + Au

Abstract

The ratio of the shear viscosity ($\eta$) to entropy density ($s$) for the intermediate energy heavy-ion collisions has been calculated by using the Green-Kubo method in the framework of the quantum molecular dynamics model. The theoretical curve of $\eta /s$ as a function of the incident energy for the head-on Au+Au collisions displays that a minimum region of $\eta /s$ has been approached at higher incident energies, where the minimum $\eta /s$ value is about 7 times Kovtun-Son- Starinets (KSS) bound (1/4$\pi$). We argue that the onset of minimum $\eta /s$ region at higher incident energies corresponds to the nuclear liquid gas phase transition in nuclear multifragmentation.

6 pages, 8 figures

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• Correlation between elliptic flow and shear viscosity in intermediate-energy heavy-ion collisions
• Iso-vector dipole resonance and shear viscosity in low energy heavy-ion collision