Investigation on quantum transport associated with chirality and vorticity in quantum chromodynamics

量子色动力学中与手性和涡度相关的量子输运研究

• 批准号: 20K14470
• 负责人: 楊 廸倫
• 金额: $ 2.33万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Early-Career Scientists
• 财政年份: 2020
• 资助国家: 日本
• 起止时间: 2020-04-01 至 2021-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20K14470/
• 关键词: quantum kinetic theory; quark gluon plasma; chiral anomaly; heavy ion collisions; spin polarization; Quantum chromodynamics; Heavy ion collisions; Quark gluon plasmas; Chiral anomaly; Transport theory

As mentioned in the proposal, we aim at exploring how the chiral anomaly, spin-orbit interaction, and related quantum effects affect “the intertwined charge/spin transport of quark gluon plasma (QGP) and of the pre-equilibrium phase in heavy ion collisions. One of the important purposes is to understand how the spin of quarks and also of gluons are dynamically polarized by vortical or electromagnetic fields and their contributions to experimental observables.To track dynamical spin polarization particularly triggered by the collisional processes with spin-orbit interaction, it is necessary to modify the standard kinetic theory. By utilizing the Wigner-function approach, we have derived a generic formalism of the quantum kinetic theory (QKT) for massive fermions with quantum corrections in the collision term characterized by self energies, which paves the way to study dynamical spin polarization of a strange quark traversing the QGP. Such a collision term contains the quantum correction led by self-energy gradients, from which the spin polarization could be induced by space-time inhomogeneity of the medium such as local vorticity, as the generalization for side-jump corrections upon massless fermions in the previously derived chiral kinetic theory. In addition to the study of fermions, we have also constructed the QKT for photons, which could be directly generalized to that for weakly coupled gluons. Moreover, we have studied how local vorticity could affect not only spin polarization of hadrons but also the yields for hadrons with different spins.

正如提案中提到的，我们的目标是探索手性异常、自旋轨道相互作用和相关量子效应如何影响“夸克胶子等离子体（QGP）和重离子碰撞中预平衡相的相互交织的电荷/自旋输运。重要目的之一是了解夸克和胶子的自旋如何被涡流或电磁场动态极化及其贡献 为了跟踪动态自旋极化，特别是由自旋轨道相互作用的碰撞过程引发的动态自旋极化，有必要修改标准动力学理论。通过利用维格纳函数方法，我们推导出了大质量费米子量子动力学理论（QKT）的通用形式，并在以自能为特征的碰撞项中进行了量子修正，这为研究动态自旋极化铺平了道路 奇怪的夸克穿过 QGP。这样的碰撞项包含由自能梯度引起的量子校正，自旋极化可以由介质的时空不均匀性（例如局域涡度）引起，作为先前推导的手性动力学理论中无质量费米子侧跳校正的推广。除了费米子的研究之外，我们还构建了光子的QKT， 可以直接推广到弱耦合胶子。此外，我们还研究了局部涡度如何不仅影响强子的自旋极化，而且影响不同自旋强子的产额。

项目成果

Dark matter in E6 Grand unification

E6大统一中的暗物质

• DOI: 10.1007/jhep02
• 发表时间: 2018
• 期刊: Journal of High Energy Physics
• 影响因子: 5.4
• 作者: J. Schwichtenberg

Signatures of the vortical quark-gluon plasma in hadron yields

强子产量中涡旋夸克-胶子等离子体的特征

• DOI: 10.1103/physrevc.102.021901
• 发表时间: 2020-02
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: Hidetoshi Taya;Aaron Park;Sungtae Cho;Philipp Gubler;Koichi Hattori;Juhee Hong;Xu-Guang Huang
• 通讯作者: Xu-Guang Huang