潮汐与搜寻：莱曼-α森林及设计样本中的各向异性尺度依赖偏置
Tide-and-Seek: Anisotropic scale-dependent bias in the Lyman-alpha forest and designer samples
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中文总结 AI 辅助
本文证明各向异性原初非高斯性引起的尺度依赖偏置可出现在更广泛的示踪体中，并通过莱曼-α森林和形状选择暗物质晕的模拟验证，应用于BOSS DR12数据未发现该信号。
中文摘要 AI 辅助
寻找原初非高斯性是了解早期宇宙新信息的强大途径。在晚期宇宙中观测原初信号颇具挑战性，因为通常难以将微小的原初特征与描述星系分布和大尺度宇宙结构的复杂物理过程区分开来。我们证明，在挤压极限下具有非平凡方向依赖性的原初非高斯性（也称为各向异性原初非高斯性）所产生的尺度依赖偏置，可以在比之前认为的更广泛的示踪体类别中出现。这是原初宇宙物理的一个确凿标志性特征，无法被晚期宇宙过程所模仿。我们通过莱曼-α森林以及根据其投影形状选择的暗物质晕的模拟明确证明了这一点。前者是标准宇宙学探针，标准分析可以简单地扩展以约束这种效应。后者提供了一种有趣的新方法：设计具有强选择效应的样本，以提供对原初物理的新敏感性。作为这些概念的演示，我们将此方法应用于BOSS DR12数据，未发现各向异性非高斯性的证据。
英文摘要
Searches for primordial non-Gaussianity are powerful ways of learning new information about the early Universe. Observing primordial signals in the late Universe is challenging as, in general, it is difficult to disentangle the small, primordial signatures from the complex physics that describes the distribution of galaxies and large-scale cosmic structures. We demonstrate that scale-dependent bias from primordial non-Gaussianity with non-trivial directional dependence in the squeezed limit (also known as anisotropic primordial non-Gaussianity) can arise in a much larger class of tracers than previously considered. This is a smoking gun signature of primordial Universe physics that cannot be mimicked by late-Universe processes. We demonstrate this explicitly with simulations of the Lyman-$α$ forest and halos selected through their projected shape. The former is a standard cosmological probe and standard analyses could be simply extended to constrain this. The latter provides an interesting new approach: design samples with strong selection effects to provide new sensitivity to primordial physics. As a demonstration of these concepts, we apply this method to BOSS DR12 data, finding no evidence of anisotropic non-Gaussianity.
发表机构
- University of Cambridge（剑桥大学）
- Kavli Institute for Cosmology Cambridge（卡弗里宇宙学剑桥研究所）
- University of Oxford（牛津大学）
- University of Hertfordshire（赫特福德大学）
机构由 AI 辅助整理，请以论文原文为准。
