arXiv 1907.051512019-07-11astro-ph.COgr-qchep-ph

宇宙学参数对红移漂移约束的预测

Forecasts of redshift drift constraints on cosmological parameters

C. S. Alves, A. C. O. Leite, C. J. A. P. Martins, J. G. B. Matos, T. A. Silva

备注：: 19 pages, 10 figures, 4+2 tables; to appear in MNRAS
DOI：: 10.1093/mnras/stz1934

摘要：

宇宙学观测通常绘制我们现在过去的光锥。然而，也可以比较不同的过去光锥。这就是红移漂移背后的概念，一个与模型无关的基本宇宙学探测。用简单的物理术语来说，这有效地使我们能够实时观察宇宙的膨胀。虽然目前的设施只允许比预期信号差几个数量级的灵敏度，但应该有可能用即将到来的信号检测到它。在这里，我们讨论了三个这样的设施的测量的潜在影响：极大望远镜（大多数现有的红移漂移预测的主题），但也平方公里阵列和强度映射实验。对于这些中的每一个，我们假设分别在Liske { \it et al.}（2008）、Klockner { \it等人}（2015）和Yu { \it等人}（2014年）。我们专注于这些测量的作用，在约束暗能量的情况下，突出的事实是，虽然他们自己产生相对较弱的约束，他们的探测区域的参数空间，通常是不同的探测其他实验，以及红移依赖。具体来说，我们量化了如何组合的几个红移漂移测量在不同的红移，或组合的红移漂移测量与其他典型的宇宙学探测，可以约束一些代表性的暗能量模型。我们的结论是，一个独立于模型的宇宙膨胀从红移$z=0$到$z=4$的映射-下一代天体物理设施的一个具有挑战性但可行的目标-可以对基本宇宙学产生重大影响。

英文摘要：

Cosmological observations usually map our present-day past light cone. However, it is also possible to compare different past light cones. This is the concept behind the redshift drift, a model-independent probe of fundamental cosmology. In simple physical terms, this effectively allows us to watch the Universe expand in real time. While current facilities only allow sensitivities several orders of magnitude worse than the expected signal, it should be possible to detect it with forthcoming ones. Here we discuss the potential impact of measurements by three such facilities: the Extremely Large Telescope (the subject of most existing redshift drift forecasts), but also the Square Kilometre Array and intensity mapping experiments. For each of these we assume the measurement sensitivities estimated respectively in Liske {\it et al.} (2008), Klockner {\it et al.} (2015) and Yu {\it et al.} (2014). We focus on the role of these measurements in constraining dark energy scenarios, highlighting the fact that although on their own they yield comparatively weak constraints, they do probe regions of parameter space that are typically different from those probed by other experiments, as well as being redshift-dependent. Specifically, we quantify how combinations of several redshift drift measurements at different redshifts, or combinations of redshift drift measurements with those from other canonical cosmological probes, can constrain some representative dark energy models. Our conclusion is that a model-independent mapping of the expansion of the universe from redshift $z=0$ to $z=4$---a challenging but feasible goal for the next generation of astrophysical facilities---can have a significant impact on fundamental cosmology.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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