论文标题
关于光晕的运动学形态
On the Kinematic Morphology around Halos
论文作者
论文摘要
在本文中，我们报告了与Splashback半径相关的Halos边缘周围的一种有趣的运动学现象。壳交叉后，宇宙流通过溪流混合表现出各种旋转形态。涡度是以与大规模结构一致的特定方式产生的。值得注意的是，一种特定的流动形态是向内螺旋螺旋形的，朝第三方向压缩，它集中在光环周围。一项详细的检查显示，其体积分数的对数衍生物发生了急剧变化，与定义为最外部苛性碱结构的飞溅半径的位置相吻合。这样的功能编码有价值的相位空间信息，并提供了了解Halos动态演变的新观点。作为体积加权的数量，流动形态的特征纯粹是运动学的。与其他相关研究不同，旋转流形态捕获了多流域区域中各向异性相结构。
In this paper, we report an interesting kinematic phenomenon around the halos' edge related to the splashback radius. After the shell-crossing, cosmic flow exhibits various rotational morphologies via stream-mixing. Vorticity is generated in a particular way that coincides with the large-scale structure. Notably, one specific flow morphology, which is spiraling inward and compressing in the third direction, concentrates around halos. A detailed examination that reveals a sharp change in the logarithmic derivative of its volume fraction, coincides with the location of the splashback radius defined as the outermost caustic structure. Such a feature encodes valuable phase space information and provides a new perspective on understanding the dynamical evolution of halos. As a volume-weighted quantity, the profile of flow morphology is purely kinematic. And unlike other related studies, the rotational flow morphologies capture the anisotropic phase structure in the multi-stream region.
