1206.6694 (C. L. Zhou et al.)

Ratio of shear viscosity to entropy density in multifragmentation of Au
+ Au    [PDF]

C. L. Zhou, Y. G. Ma, D. Q. Fang, S. X. Li, G. Q. Zhang

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.

View original: http://arxiv.org/abs/1206.6694