Yu Hao-Ran, Motloch Pavel, Pen Ue-Li, Yu Yu, Wang Huiyuan, Mo Houjun, Yang Xiaohu, Jing Yipeng
Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, China.
Canadian Institute for Theoretical Astrophysics, University of Toronto, M5S 3H8, Ontario, Canada.
Phys Rev Lett. 2020 Mar 13;124(10):101302. doi: 10.1103/PhysRevLett.124.101302.
Chiral symmetry is maximally violated in weak interactions [1], and such microscopic asymmetries in the early Universe might leave observable imprints on astrophysical scales without violating the cosmological principle. In this Letter, we propose a helicity measurement to detect primordial chiral violation. We point out that observations of halo-galaxy angular momentum directions (spins), which are frozen in during the galaxy formation process, provide a fossil chiral observable. From the clustering mode of large scale structure of the Universe, we construct a spin mode in Lagrangian space and show in simulations that it is a good probe of halo-galaxy spins. In the standard model, a strong symmetric correlation between the left and right helical components of this spin mode and galaxy spins is expected. Measurements of these correlations will be sensitive to chiral breaking, providing a direct test of chiral symmetry breaking in the early Universe.
手征对称性在弱相互作用中被最大程度地破坏[1]，早期宇宙中的这种微观不对称性可能会在不违反宇宙学原理的情况下在天体物理尺度上留下可观测的印记。在本信函中，我们提出一种螺旋度测量方法来探测原初手征破坏。我们指出，对在星系形成过程中被冻结的晕星系角动量方向（自旋）的观测提供了一种可观测的手征化石。从宇宙大尺度结构的聚类模式出发，我们在拉格朗日空间中构建了一个自旋模式，并在模拟中表明它是晕星系自旋的一个良好探针。在标准模型中，预计这种自旋模式的左右螺旋分量与星系自旋之间存在强烈的对称相关性。对这些相关性的测量将对手征破缺敏感，从而为早期宇宙中的手征对称性破缺提供直接检验。
