Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-05-21
Annalen Phys.522:849-856,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 Pages, 5 figures with 5 eps graphs
Scientific paper
10.1002/andp.201000056
Assuming that the Hagedorn fluid composed of known particles and resonances with masses $m<2\,$GeV obeys the {\it first-order} theory (Eckart) of relativistic fluid, we discuss the transport properties of QCD confined phase. Based on the relativistic kinetic theory formulated under the relaxation time approximation, expressions for bulk and shear viscosity in thermal medium are derived. The relaxation time in the Hagedorn dynamical fluid exclusively takes into account the decay and eventually van der Waals processes. We comment on the {\it in-medium} thermal effects on bulk and shear viscosities and averaged relaxation time with and without the excluded-volume approach. As an application of these results, we suggest the dynamics of heavy-ion collisions, non-equlibrium thermodynamics and the cosmological models, which require thermo and hydrodynamics equations of state.
Tawfik A.
Wahba M.
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