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arXiv 1902.02607hep-phhep-latnucl-th
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单圈近似下强磁场作用下解压缩QCD物质的各向异性压力

Anisotropic pressure of deconfined QCD matter in presence of strong magnetic field within one-loop approximation

Bithika Karmakar, Ritesh Ghosh, Aritra Bandyopadhyay, Najmul Haque, Munshi G Mustafa

摘要:

考虑夸克和胶子两点函数的一般结构,我们计算了重离子碰撞中产生的强磁化热致密QCD物质的自由能和压强。在强磁场的存在下,我们发现退精细QCD物质具有顺磁性质。由于系统获得的磁化强度,在平行于和垂直于磁场的方向上得到不同的压力。我们得到了在磁场存在下热退禁闭QCD物质的纵向和横向压力以及磁化强度。我们采用硬热环近似(HTL)的热浴。在一定的近似下,得到了压强和磁化强度的完全解析表达式。自由能中出现的各种分歧使用适当的计数器项进行调节。所得到的各向异性压力可用于描述重离子碰撞中产生的热而致密的退精细QCD物质。

英文摘要:

Considering the general structure of the two point functions of quarks and gluons, we compute the free energy and pressure of a strongly magnetized hot and dense QCD matter created in heavy-ion collisions. In presence of strong magnetic field we found that the deconfined QCD matter exhibits a paramagnetic nature. One gets different pressure in a direction parallel and perpendicular to magnetic field due to the magnetization acquired by the system. We obtain both longitudinal and transverse pressure, and magnetization of a hot deconfined QCD matter in presence of magnetic field. We have used hard thermal loop approximation (HTL) for heat bath. We obtained completely analytic expression for pressure and magnetization under certain approximation. Various divergences appearing in free energy are regulated using appropriate counter terms. The obtained anisotropic pressure may be useful for magnetohydrodynamics description of a hot and dense deconfined QCD matter produced in heavy-ion collisions.

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