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arXiv 1202.5155nucl-thhep-ph
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准粒子模型中各向异性膨胀夸克-胶子等离子体的输运性质

Transport properties of anisotropically expanding quark-gluon plasma within a quasi-particle model

Vinod Chandra

摘要:

在最近提出的(2+1)味格点量子色动力学状态方程准粒子模型下,采用半经典输运理论研究了相对论重离子碰撞中产生的夸克胶子等离子体的体粘滞系数和剪切粘滞系数($η$和$ζ$).这些输运参数对热QCD中存在的相互作用非常敏感。研究了胶子部分和物质部分对输运系数的贡献。在$η$和$ζ$的情况下,物质部分被发现是显着占主导地位的胶子部门。量$ζ/{\mathcal S}$和$ζ/η$的温度依赖性表明$ζ$有急剧上升的趋势,更接近QCD转变温度。$η$和$ζ$对于相对论重离子碰撞实验中可达到的温度具有同等重要的意义,因此在研究夸克-胶子等离子体的性质时起着至关重要的作用.

英文摘要:

The bulk and shear viscosities ($η$ and $ζ$) have been studied for quark-gluon-plasma produced in relativistic heavy ion collisions within semi-classical transport theory, in a recently proposed quasi-particle model of (2+1)-flavor lattice QCD equation of state. These transport parameters have been found to be highly sensitive to the interactions present in hot QCD. Contributions to the transport coefficients from both the gluonic sector and the matter sector have been investigated. The matter sector is found to be significantly dominating over the gluonic sector, in both the cases of $η$ and $ζ$. The temperature dependences of the quantities, $ζ/{\mathcal S}$, and $ζ/η$ indicate a sharply rising trend for the $ζ$, closer to the QCD transition temperature. Both $η$, and $ζ$ are shown to be equally significant for the temperatures that are accessible in the relativistic heavy ion collision experiments, and hence play crucial role while investigating the properties of the quark-gluon plasma.

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