arXiv 0804.02552008-04hep-ph

夸克-胶子等离子体的磁性成分也是液态！

Magnetic Component of Quark-Gluon Plasma is also a Liquid!

Jinfeng Liao, Edward Shuryak

备注：: 4 pages, 4 figures. All figs updated. Important changes and new results included in v4
发表信息：: Phys.Rev.Lett.101:162302,2008
DOI：: 10.1103/PhysRevLett.101.162302

摘要：

\cite{Liao_ES_mono}最近提出的磁方案强调了磁单极子在强耦合夸克-胶子等离子体（sQGP）中的作用，特别预言了磁单极子通过磁瓶效应降低sQGP的粘度.在\cite{Chernodub}中，基于晶格密度的测量，提供了1-2 $T_c$中“磁性液体”的论据。在这里，我们提出了从相同的经典分子动力学模拟，这被发现是在最近的晶格结果\cite{D'Alessandro:2007su}非常好的协议的结果，为π-（反）π关联函数。我们表明，磁库仑耦合的方向$opposite$的电，正如预期的那样，它是大致逆的渐近自由度公式的电。然而，随着$T$减小到$T_c$，磁耦合永远不会变弱，等离子体参数总是足够大（$Γ>1$）。这与RHIC实验的经验证据非常一致，这意味着磁性物体不可能有大的平均自由程，并且还应该形成低粘度的良好液体。

英文摘要：

The so called magnetic scenario recently suggested in \cite{Liao_ES_mono} emphasizes the role of monopoles in strongly coupled quark-gluon plasma (sQGP) near/above the deconfinement temperature, and specifically predicts that they help reduce its viscosity by the so called "magnetic bottle" effect. Arguments for "magnetic liquid" in 1-2$T_c$ based on lattice measurement of monopole density were provided in \cite{Chernodub}. Here we present results for monopole-(anti)monopole correlation functions from the same classical molecular dynamics simulations, which are found to be in very good agreement with recent lattice results \cite{D'Alessandro:2007su}. We show that the magnetic Coulomb coupling does run in the direction $opposite$ to the electric one, as expected, and it is roughly inverse of the asymptotic freedom formula for the electric one. However, as $T$ decreases to $T_c$, the magnetic coupling never gets weak, with the plasma parameter always large enough ($Γ>1$). This nicely agrees with empirical evidences from RHIC experiments, implying that magnetic objects cannot have large mean free path and should also form a good liquid with low viscosity.

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