Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-07-05
Nucl.Phys.A848:428-442,2010
Physics
Nuclear Physics
Nuclear Theory
20 pages, 11 figures
Scientific paper
10.1016/j.nuclphysa.2010.09.011
Relativistic dissipative hydrodynamic equations are extended by taking into account particle number changing processes in a gluon system, which expands in one dimension boost-invariantly. Chemical equilibration is treated by a rate equation for the particle number density based on Boltzmann equation and Grad's ansatz for the off-equilibrium particle phase space distribution. We find that not only the particle production, but also the temperature and the momentum spectra of the gluon system, obtained from the hydrodynamic calculations, are sensitive to the rates of particle number changing processes. Comparisons of the hydrodynamic calculations with the transport ones employing the parton cascade BAMPS show the inaccuracy of the rate equation at large shear viscosity to entropy density ratio. To improve the rate equation, the Grad's ansatz has to be modified beyond the second moments in momentum.
El Andrej
Greiner Carsten
Muronga Azwinndini
Xu Zhe
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