发表机构
University of Cambridge; Kavli Institute for Cosmology Cambridge; University of Oxford; Ludwig-Maximilians-Universität; Institute of Astronomy, University of Cambridge（剑桥大学; 剑桥卡弗里宇宙学研究所; 牛津大学; 路德维希-马克西米利安大学（慕尼黑大学）; 剑桥大学天文研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出利用动量场的密度-密度-动量双谱作为宇称破缺的新型低阶探针，其低维度简化了分析，Fisher预测显示对kSZ与星系聚类交叉双谱的约束具有竞争力，且易于整合到现有流程中。
AI 中文摘要
宇称破缺的初始条件是超越单场慢滚范式的暴胀动力学中独特且令人信服的信号，它们对晚期观测可测量量分布的影响可以很容易地与引力非线性和星系形成物理的影响区分开来。在这项工作中，我们提出利用动量场 $\mathbf{p} = (1+\delta)\mathbf{v}$，特别是密度-密度-动量双谱，作为原初宇称破缺的新型探针。这类双谱极大地补充了使用密度场四点统计量的传统搜索方法，提供了对宇称破缺物理敏感的新观测可测量量。同时，其较低维度显著降低了分析高维数据向量及其协方差所涉及的复杂性。我们证明，即使我们只能观测到动量场沿视线方向的投影，密度-密度-动量双谱对宇称破缺效应的敏感性仍然存在。我们对动力学Sunyaev-Zel'dovich（kSZ）各向异性与星系聚类的交叉双谱中极端压缩模板的宇称破缺振幅进行了Fisher预测，并发现与现有方法相比，我们的方法给出了具有竞争力的约束。我们的方法可以轻松地整合到现有流程中以研究宇称破缺，并且由于星系-星系-kSZ双谱是一个关键的宇宙学探针，可以利用现有的大量致力于缓解系统误差和协方差建模的工作。
英文摘要
Parity-violating initial conditions are uniquely compelling signatures of inflationary dynamics beyond the single-field slow-roll paradigm, and their effects on the distribution of late-time observables can be easily separated from that of gravitational nonlinearities and galaxy formation physics. In this work, we propose using the momentum field, $\mathbf{p} = (1+δ)\mathbf{v}$, and, in particular, the density-density-momentum bispectrum as a novel probe of primordial parity violation. This class of bispectra greatly complements traditional searches using four-point statistics of the density field, furnishing new observables that can be sensitive to parity-violating physics. At the same time, its lower dimensionality substantially reduces the complexity associated with analysing high-dimensional data vectors and their covariance. We show that the sensitivity of the density-density-momentum bispectrum to parity violation effects persists even if we can only observe the projection of the momentum field along the line-of-sight. We perform a Fisher forecast for the parity-violating amplitude of the ultra-squeezed template in the cross bispectrum of kinetic Sunyaev-Zel'dovich (kSZ) anisotropies and galaxy clustering, and we find that our approach give competitive constraints when compared to existing methods. Our method can be easily co-opted to existing pipelines to study parity violation and, as the galaxy-galaxy-kSZ bispectrum is a key cosmological probe, take advantage of the significant existing efforts dedicated to mitigating systematics and covariance modelling.
Comments45 pages of text and 7 figures. Comments are welcome
