论文标题
轨道物理学中轨道和旋转角动量的相对论分解以及Feynman的角动量悖论
Relativistic decomposition of the orbital and the spin angular momentum in chiral physics and Feynman's angular momentum paradox
论文作者
论文摘要
近年来，我们在对角动量分解的理解中目睹了巨大的进步。在高能过程中质子自旋问题的背景下，基于规范定义的Jaffe和Manohar的角动量分解，而基于Belinfante改进的JI的替代方案已在Chen等人的光下重新审视。 leading to seminal works by Hatta, Wakamatsu, Leader, etc. In chiral physics as exemplified by the chiral vortical effect and applications to the relativistic nucleus-nucleus collisions, sometimes referred to as a relativistic extension of the Barnett and the Einstein--de Haas effects, such arguments of the angular momentum decomposition would be of crucial importance.我们特别注意规范和贝林凡特公约中的费米子部分，并讨论了它们之间的区别，这让人想起了Feynman的角度动量悖论的经典例子。我们指出它可能与核核碰撞中的早期动力学相关，从而导致电磁角动量过量。
Over recent years we have witnessed tremendous progresses in our understanding on the angular momentum decomposition. In the context of the proton spin problem in high energy processes the angular momentum decomposition by Jaffe and Manohar, which is based on the canonical definition, and the alternative by Ji, which is based on the Belinfante improved one, have been revisited under light shed by Chen et al. leading to seminal works by Hatta, Wakamatsu, Leader, etc. In chiral physics as exemplified by the chiral vortical effect and applications to the relativistic nucleus-nucleus collisions, sometimes referred to as a relativistic extension of the Barnett and the Einstein--de Haas effects, such arguments of the angular momentum decomposition would be of crucial importance. We pay our special attention to the fermionic part in the canonical and the Belinfante conventions and discuss a difference between them, which is reminiscent of a classical example of Feynman's angular momentum paradox. We point out its possible relevance to early-time dynamics in the nucleus-nucleus collisions, resulting in excess by the electromagnetic angular momentum.
