Victor Roy, A. K. Chaudhuri
We have studied the effect of nonzero bulk viscosity with peak near the
lattice QCD predicted crossover temperature $T_{co}\sim 175 MeV$ on charged
particle transverse momentum spectra and elliptic flow. The Israel-Stewart
theory of 2nd order causal dissipative relativistic fluid dynamics is used to
simulate the space time evolution of the matter formed in Au-Au collisions at
$\sqrt{s_{NN}}$=200 GeV assuming longitudinal boost invariance. A systematic
comparison of temperature, transverse velocity, spatial and momentum anisotropy
evolution of the ideal, bulk and shear viscous fluid has been carried out. Two
different temperature dependent forms of $\zeta/s$ and a constant $\eta/s$ was
used. Both the bulk and shear viscous correction to the ideal freezeout
distribution function are included. The dissipative correction to the freezeout
distribution for bulk viscosity was calculated using Grad's fourteen moment
method. From our simulation we show that the method is applicable only for
$\zeta/s < 0.005\times\eta/s|_{KSS}$ for freezeout temperatures 130 and 160
MeV.
View original:
http://arxiv.org/abs/1109.1630
No comments:
Post a Comment