Effects of EoS in viscous hydro + cascade model for the RHIC Beam Energy Scan

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• 作者：Iu. Karpenko^a ; ^b ; ^c ; M. Bleicher^c ; ^d ; P. Huovinen^c ; ^d ; ^e ; H. Petersen^c ; ^d ; ^f
• 关键词：quark-gluon plasma ; relativistic hydrodynamics ; hadron cascade
• 刊名：Nuclear Physics A
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：956
• 期：Complete
• 页码：834-837
• 全文大小：171 K

文摘

A state-of-the-art 3+1 dimensional cascade + viscous hydro + cascade model vHLLE+UrQMD has been applied to heavy ion collisions in RHIC Beam Energy Scan range i1" class="mathmlsrc">i1.gif&_user=111111111&_pii=S0375947416001172&_rdoc=1&_issn=03759474&md5=cc5343deb5eb98e66ac351b525ee355d">i1.gif">. Based on comparison to available experimental data it was estimated that an effective value of shear viscosity over entropy density ratio η/s$\eta /s$ in hydrodynamic stage has to decrease from η/s=0.2$\eta /s=0.2$ to 0.08 as collision energy increases from $\sqrt{s_{\mathrm{NN}}}=7.7$ to 39 GeV, and to stay at η/s=0.08$\eta /s=0.08$ for $39\le \sqrt{s}\le 200\text{GeV}$.

In this work we show how an equation of state with first order phase transition affects the hydrodynamic evolution at those collision energies and changes the results of the model as compared to “default scenario” with a crossover type EoS from chiral model.