论文标题
用功率谱和未来21厘米强度图的功率谱和双光谱探测原始非高斯性
Probing primordial non-Gaussianity with the power spectrum and bispectrum of future 21cm intensity maps
论文作者
论文摘要
回报后，星系中中性氢的21厘米发射线提供了暗物质的示踪剂。下一代强度映射调查，带有SKA和其他射电望远镜，将覆盖大型的天空区域和各种红移，从而促进它们用作原始非高斯性的探针。 {以前的作品表明，双光谱可以对原始非高斯性达到严格的约束，并有目的地设计用于在干涉仪模式下强度映射的未来调查}。在这里，我们调查了从单次模式下运行的调查，\ rev {使用组合功率谱和双光谱信号}可获得的约束。在功率谱的情况下，单次调查通常优于外加干涉仪调查。我们发现双光谱的反面保持：单次调查与设计用于干涉仪模式的调查不具有竞争力。
After reionisation, the 21cm emission line of neutral hydrogen within galaxies provides a tracer of dark matter. Next-generation intensity mapping surveys, with the SKA and other radio telescopes, will cover large sky areas and a wide range of redshifts, facilitating their use as probes of primordial non-Gaussianity. {Previous works have shown that the bispectrum can achieve tight constraints on primordial non-Gaussianity with future surveys that are purposely designed for intensity mapping in interferometer mode}. Here we investigate the constraints attainable from surveys operating in single-dish mode, \rev{using the combined power spectrum and bispectrum signal}. In the case of the power spectrum, single-dish surveys typically outperform interferometer surveys. We find that the reverse holds for the bispectrum: single-dish surveys are not competitive with surveys designed for interferometer mode.
