论文标题
au+au反应中的$η/s $的第一个估计值
A first estimate of $η/s$ in Au+Au reactions at E$_{\rm lab}=1.23$ $A$GeV
论文作者
论文摘要
GSI的HADES实验最近提供了有关流量系数的数据$ v_1，...，V_4 $ au+au反应的质子$ e _ {\ rm lab} = 1.23 $〜$ a $ a $ gev（或$ \ \ sqrt {s_ \ s_ \ s_ \ nnn} nnn}} = 2.4 $ gev）。与实验数据相比，该数据允许通过对流量谐波的口气传输模拟的粗晶片分析来估计熵比的剪切粘度，而在低能量下的$η/s $。通过这种情况，我们可以在如此低的能量下首次提供估计$η/s \ oft of0.65 \ pm0.15 $（或$（8 \ pm2）\，（4π）^{ - 1} $）。
The HADES experiment at GSI has recently provided data on the flow coefficients $v_1,...,v_4$ for protons in Au+Au reactions at $E_{\rm lab} = 1.23$~$A$GeV (or $\sqrt{s_\mathrm{NN}}=2.4$ GeV). This data allows to estimate the shear viscosity over entropy ratio, $η/s$ at low energies via a coarse graining analysis of the UrQMD transport simulations of the flow harmonics in comparison to the experimental data. By this we can provide for the first time an estimate of $η/s\approx0.65\pm0.15$ (or $(8\pm2)\,(4π)^{-1}$) at such low energies.
