论文标题
耦合parsec和gigaparsec量表：原始非高斯与多跟踪强度映射
Coupling parsec and gigaparsec scales: primordial non-Gaussianity with multi-tracer intensity mapping
论文作者
论文摘要
原始非高斯（PNG）是对早期宇宙原始波动起源的关键探测。已经表明，大规模结构的多跟踪测量值可以产生PNG的高精度测量值。未来的线强度映射调查非常适合这些测量，因为它们可以快速调查大量量并访问PNG变得重要的大尺度。在本文中，我们首次探讨了使用强度映射调查的多跟踪PNG测量结果取决于驱动线排放的亚半乳量表物理。我们考虑了CO地图之间的一个示例互相关，并量化了改变天体物理模型对$ F _ {\ Mathrm {nl}} $测量的影响。我们在水平尺度的PNG测量和分子云尺度的星际介质之间找到了一个非平凡的耦合，该培养基可以对$ f _ {\ mathrm {nl}} $约束具有近乎实验性实验敏感性的订单统一效应。我们讨论这些影响如何取决于噪声水平和调查设计。我们进一步发现，互相关的射击噪声几乎是强度映射测量值所独有的效果，可以在多跟踪分析中起重要作用，因此不应忽略。
Primordial non-Gaussianity (PNG) is a key probe of the origins of primordial fluctuations in the early universe. It has been shown that multi-tracer measurements of large-scale structure can produce high-precision measurements of PNG. Future line intensity mapping surveys are well-suited to these measurements owing to their ability to rapidly survey large volumes and access the large scales at which PNG becomes important. In this paper, we explore for the first time how multi-tracer PNG measurements with intensity mapping surveys depend on the sub-galactic scale physics which drives line emission. We consider an example cross-correlation between CO maps, and quantify the impact varying the astrophysical model has on $f_{\mathrm{NL}}$ measurements. We find a non-trivial coupling between horizon-scale PNG measurements and the molecular cloud-scale interstellar medium that can have order unity effects on $f_{\mathrm{NL}}$ constraints with near-future experimental sensitivities. We discuss how these effects depend on noise level and survey design. We further find that the cross-correlation shot noise, an effect nearly unique to intensity mapping measurements, can play an important role in multi-tracer analyses and should not be neglected.
