用AdS/CFT研究重夸克偶素熔解

Melting of heavy quarkonium is one of the main signatures for QGP formation. Recently, the entropic force has been proposed for dissociating the quarkonium and has been studied from AdS/CFT. However, there may exist strong electromagnetic field in experiments. Therefore, the effect of electromagnetic field should be taken into account. In this project, we would like to study the influence of electromagnetic field on the entropic force in a strongly coupled N=4 SYM plasma from AdS/CFT. We will discuss how the electromagnetic field affects the heavy quarkonium dissociation. In addition, we will examine some higher derivative corrections to the entropic force. Our results will be compared with lattice simulation and experiments. The successful implementation of this project not only helps us to understand some important properties of strong coupling QGP but also provides a valuable reference for the studies of experiments of heavy ion collisions.

重夸克偶素熔解是QGP形成的重要信号之一。研究表明熵力可能是导致重夸克偶素熔解的原因。近期一些学者利用AdS/CFT研究了熵力并获得了有意义的结果。然而在实验中，背景里往往会存在很强的电磁场。因此，考虑电磁场的效应很有必要。本项目，我们将利用AdS/CFT研究强耦合N=4SYM等离子体中电磁场对熵力的影响，进一步探究电磁场对重夸克偶素熔解的效应。此外，我们还将考察熵力的一些高阶修正。我们的结果将会与格点模拟结果和实验结果作比较。项目的成功实施，可帮助了解强耦合QGP的一些重要性质，也能为重离子碰撞实验研究提供有价值的理论参考。

虚势和熵力可能是导致重夸克偶素熔解的两种不同机制。利用AdS/CFT我们研究了磁场、胶子凝聚、高阶修正等对它们的影响。结果表明在Tc附近，随着胶子凝聚的减少，夸克偶素更容易熔解。同时，化学势和磁场的存在也会促进其熔解。此外，我们还研究了重夸克势、施温格效应、纠缠熵等物理量在不同背景下的行为，获得了有意义的结果。受项目资助，在PRD等杂志发表第一/通讯作者SCI论文18篇。