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arXiv 1304.7752hep-phhep-lathep-thnucl-th
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强相互作用物质中的守恒电荷涨落和磁化率

Conserved Charge Fluctuations and Susceptibilities in Strongly Interacting Matter

Shuzhe Shi, Jinfeng Liao

摘要:

我们研究了由夸克-胶子等离子体激发的强相互作用物质中的守恒电荷涨落。本文用规范-引力对应方法研究了QCD的两种全息模型D_4/D_8和D_3/D_7中守恒电荷涨落的花样。我们计算并比较了两种模型中的夸克数双折射率,发现了一个有趣的共同特征:在很强的耦合下,高阶双折射率被抑制,守恒电荷涨落成为纯粹的高斯涨落。根据最先进的格点量子色动力学结果,我们还讨论了我们可以从这些关于$1\sim 2T_c$夸克-胶子等离子体的基本自由度的可计算性中学到什么,并研究了不同想法的可行性,如全息术,准粒子,以及束缚态。通过对二阶极化率的分析,我们得出了在$1\sim 2T_c$区域存在束缚态的结论。我们进一步构建和预测的几个比率的四阶极化率,可以灵敏地揭示这种束缚态。

英文摘要:

We study the conserved charge fluctuations, as quantified by the corresponding susceptibilities, in strongly interacting matter as motived by the quark-gluon plasma. Using the gauge-gravity correspondence approach, we study the patterns of conserved charge fluctuations in two types of holographic models for QCD, the D4/D8 and the D3/D7 models. We compute and compare the quark number susceptibilities in both models and find an interesting common feature of the two: at very strong coupling higher order susceptibilities are suppressed and the conserved charge fluctuations become purely Guassian. In light of the state-of-the-art lattice QCD results we also discuss what we can learn from these susceptibilities about the underlying degrees of freedom in the $1\sim 2T_c$ quark-gluon plasma and examine the viability of different ideas such as holography, quasi-particles, as well as bound states. From analyzes of second order susceptibilities we conclude that the bound states exist and are important in the $1\sim 2T_c$ region. We further construct and make predictions for several ratios of fourth-order susceptibilities that can sensitively reveal such bound states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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