SHEAR VISCOSITY OF NUCLEAR MATTER

Series: 
Nucleus Theory Seminar
Speaker and affiliation: 
Dr Aleksander MAGNER (Institute for Nuclear Research, Kiev, Ukraine)
Date: 
Mon, 2016-09-12 10:15
Venue: 
Room 22 in the NCBJ pavilion, 69 Hoża str., Warsaw
Abstract: 

Shear viscosity   is calculated for the nuclear matter described as a system of interactingnucleons with the van der Waals (VDW) equation of state. The Boltzmann-Vlasov kineticequation is solved in terms of the plane waves of the collective overdamped motion. In thefrequent collision regime, the shear viscosity depends on the particle number density n throughthe mean-field parameter a which describes attractive forces in the VDW equation. In thetemperature region T = 15 ÷ 40 MeV, a ratio of the shear viscosity to the entropy density sis smaller than 1 at the nucleon number density n = (0.5÷1.5) n0, where n0 = 0.16 fm-3 isthe particle density of equilibrium nuclear matter at zero temperature. A minimum of the /sratio takes place somewhere in a vicinity of the critical point of the VDW system. Large valuesof /s >> 1 are however found in both the low density, n << n0, and high density, n > 2n0,regions. This makes the ideal hydrodynamic approach inapplicable for these densities.


All interested are invited

J. Dąbrowski
S.G. Rohoziński
A. Sobiczewski

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