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arXiv 1202.4436hep-thhep-ph
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探测强耦合各向异性等离子体

Probing strongly coupled anisotropic plasma

Dimitrios Giataganas

摘要:

计算了强耦合各向异性N=4超杨-米尔斯等离子体中的静电势、曳力和喷注猝灭参数。我们发现,在各向异性的情况下,射流淬火一般增强,其值强烈依赖于运动夸克的方向和动量展宽发生的方向。当夸克沿各向异性方向运动时,喷注淬灭强烈增强,而沿横向运动时,动量展宽。当夸克沿横向运动时,参数变小,而动量展宽沿各向异性运动时,参数变小。最后,当夸克在横平面内运动时,观察到较弱的增强,并且加宽发生在同一平面上。平行于各向异性方向的夸克运动所受的拖曳力总是增强的。对于横向空间中的运动,与各向同性情况相比,只有速度超过临界值的夸克的拖曳力才得到增强。低于该临界值,力减小。此外,沿各向异性方向的拖曳力总是大于横向空间中的力。扩散时间与阻力成反比关系。夸克-反夸克对沿各向异性方向排列时,静电势下降,且下降幅度大于横向排列时。最后,我们对我们的结果进行了评论,并详细说明了它们与弱耦合等离子体的异同。

英文摘要:

We calculate the static potential, the drag force and the jet quenching parameter in strongly coupled anisotropic N=4 super Yang-Mills plasma. We find that the jet quenching is in general enhanced in presence of anisotropy compared to the isotropic case and that its value depends strongly on the direction of the moving quark and the direction along which the momentum broadening occurs. The jet quenching is strongly enhanced for a quark moving along the anisotropic direction and momentum broadening happens along the transverse one. The parameter gets lower for a quark moving along the transverse direction and the momentum broadening considered along the anisotropic one. Finally, a weaker enhancement is observed when the quark moves in the transverse plane and the broadening occurs on the same plane. The drag force for quark motion parallel to the anisotropy is always enhanced. For motion in the transverse space the drag force is enhanced compared to the isotropic case only for quarks having velocity above a critical value. Below this critical value the force is decreased. Moreover, the drag force along the anisotropic direction is always stronger than the force in the transverse space. The diffusion time follows exactly the inverse relations of the drag forces. The static potential is decreased and stronger decrease observed for quark-antiquark pair aligned along the anisotropic direction than the transverse one. We finally comment on our results and elaborate on their similarities and differences with the weakly coupled plasmas.

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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