论文标题
哪个是更好的宇宙学探测：数量计数或宇宙放大倍数？
Which is a better cosmological probe: Number counts or cosmic magnification?
论文作者
论文摘要
下一代的宇宙学调查将具有前所未有的测量精度，因此他们拥有将理论思想投入到迄今为止最严格的测试中的能力。但是，为了实现这些测量的全部潜力，我们需要确保应用最有效的分析工具。我们需要确定哪些宇宙学可观察到是最好的宇宙学探针。两个常用的宇宙学可观察物是星系红移数量计数和宇宙放大倍率。这两种可观察到的东西都已在宇宙学分析中进行了广泛的研究，但仅分别进行了研究。鉴于将黑暗能量（IDE）作为减轻当前宇宙学紧张局势的合理手段而出现的，我们使用角度功率谱研究了宇宙中的大尺度上的两个可观察到的物种：考虑到所有已知术语，包括相对论校正，包括观察到的过度密度。我们的结果表明，（给定的多跟踪分析）测量相对论效应和宇宙放大倍数将比所有红移z z相对较好。相反，没有相对论效应，Galaxy Redshift数量计数在探测IDE的烙印方面将相对较好。在低z（左右z = 0.1）时，相对论效应使宇宙放大倍数是对IDE烙印的相对更好的探针。而在较高的z（z <3）时，星系红移数量计数成为IDE烙印的更好探针。但是，在z = 3及更高时，我们的结果表明，这两个可观察物都足够了。
The next generation of cosmological surveys will have unprecedented measurement precision, hence they hold the power to put theoretical ideas to the most stringent tests yet. However, in order to realise the full potential of these measurements, we need to ensure that we apply the most effective analytical tools. We need to identify which cosmological observables are the best cosmological probes. Two commonly used cosmological observables are galaxy redshift number counts and cosmic magnification. Both of these observables have been investigated extensively in cosmological analyses, but only separately. In the light of interacting dark energy (IDE) emerging as a plausible means of alleviating current cosmological tensions, we investigate both observables on large scales in a universe with IDE, using the angular power spectrum: taking into account all known terms, including relativistic corrections, in the observed overdensity. Our results suggest that (given multi-tracer analysis) measuring relativistic effects with cosmic magnification will be relatively better than with galaxy redshift number counts, at all redshifts z. Conversely, without relativistic effects, galaxy redshift number counts will be relatively better in probing the imprint of IDE, at all z. At low z (up to around z = 0.1), relativistic effects enable cosmic magnification to be a relatively better probe of the IDE imprint; while at higher z (up to z < 3), galaxy redshift number counts become the better probe of IDE imprint. However, at z = 3 and higher, our results suggest that either of the observables will suffice.
