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arXiv 1012.5266hep-ph
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冷夸克-胶子等离子体中的胶子凝聚

Gluon condensates in a cold quark gluon plasma

D. A. Fogaça, F. S. Navarra

摘要:

在RHIC上观测到的夸克-胶子等离子体是一个强相互作用系统,被称为sQGP。这是一个处于高温和几乎为零的重子化学势的系统。致密恒星的核心可能存在类似的系统,具有高化学势和几乎为零的温度。很可能它也是一个强相互作用的系统。这种强相互作用可能部分是由于非微扰效应,它在解除禁闭跃迁后仍然存在,并且与sQGP中的非零胶子凝聚有关。本文从QCD拉格朗日量出发,对胶子场进行了低(软)、高(硬)动量分量的分解,对硬胶子作了平均场近似,并取等离子体中软胶子场的矩阵元。后者与二维和四维的凝聚有关。通过这些近似,我们推导出状态方程的解析表达式,并与MIT袋模型进行了比较。凝聚体的作用是软化状态方程,而硬胶子则显著增加了能量密度和压力。

英文摘要:

The quark gluon plasma which has been observed at RHIC is a strongly interacting system and has been called sQGP. This is a system at high temperatures and almost zero baryon chemical potential. A similar system with high chemical potential and almost zero temperature may exist in the core of compact stars. Most likely it is also a strongly interacting system. The strong interactions may be partly due to non-perturbative effects, which survive after the deconfinement transition and which can be related with the non-vanishing gluon condensates in the sQGP. In this work, starting from the QCD Lagrangian we perform a gluon field decomposition in low ("soft") and high ("hard") momentum components, we make a mean field approximation for the hard gluons and take the matrix elements of the soft gluon fields in the plasma. The latter are related to the condensates of dimension two and four. With these approximations we derive an analytical expression for the equation of state, which is compared to the MIT bag model one. The effect of the condensates is to soften the equation of state whereas the hard gluons significantly increase the energy density and the pressure.

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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