论文标题
glasma中重夸克角动量的各向异性波动
Anisotropic fluctuations of angular momentum of heavy quarks in the Glasma
论文作者
论文摘要
我们研究了高能核冲突的早期阶段，重夸克的角动量的演变，其中背景是由不断发展的Glasma场制成的。鉴于问题的新颖性，我们将自己限制在使用具有较大，非物理质量的玩具重型夸克，以便在非相关性极限中实现角动量的动力学方程。我们发现，由于背景场的各向异性，角动量波动也是各向异性的：我们以简单的术语理解了这一点，将角动量（$ L $）与线性动量的波动相关。轨道角动量扩散并发展出很大的波动和各向异性，但自旋却没有。因此，我们可以通过总角动量$ j = l + s $来确定$ l $的波动。因此，我们的研究表明，在高能核碰撞的早期，重夸克的总角动量将引起各向异性波动。
We study the evolution of the angular momentum of the heavy quarks in the very early stage of high energy nuclear collisions, in which the background is made of evolving Glasma fields. Given the novelty of the problem, we limit ourselves to the use of toy heavy quarks with a large, unphysical mass, in order to implement the kinetic equations for the angular momentum in the non-relativistic limit. We find that as a consequence of the anisotropy of the background fields, angular momentum fluctuations are also anisotropic: we understand this in simple terms relating the fluctuations of the angular momentum, $L$, to those of linear momentum. While orbital angular momentum diffuses and develops substantial fluctuations and anisotropies, the spin does not. Hence, we can identify the fluctuations of $L$ with those of the total angular momentum $J=L + S$. Therefore, our study suggests that the total angular momentum of the heavy quarks in the early stage of high energy nuclear collisions will present anisotropic fluctuations.
