论文标题
通过扩展和增长来测量黑暗能量
Measuring dark energy with expansion and growth
论文作者
论文摘要
我们使用一种新型的不可知论方法结合了宇宙天文钟和结构数据的增长，以得出状态$ W $的暗能量的红移演化。背景和扰动方程式导致$ W $的两个表达式，一个纯粹基于背景，另一个也依赖于大规模结构的增长率。我们将基于增长的$ W $的功能和性能与背景$ W $进行比较，并使用高斯流程进行重建。我们发现，当前数据不够精确，无法重建两种形式的$ w $。通过使用下一代调查预期的模拟数据，我们表明这些重建将足够强大，并且基于增长的$ W $将超过背景$ W $。此外，两种形式的$ W $之间的任何分歧都将为与标准宇宙学模型的偏差提供新的测试。
We combine cosmic chronometer and growth of structure data to derive the redshift evolution of the dark energy equation of state $w$, using a novel agnostic approach. The background and perturbation equations lead to two expressions for $w$, one purely background-based and the other relying also on the growth rate of large-scale structure. We compare the features and performance of the growth-based $w$ to the background $w$, using Gaussian Processes for the reconstructions. We find that current data is not precise enough for robust reconstruction of the two forms of $w$. By using mock data expected from next-generation surveys, we show that the reconstructions will be robust enough and that the growth-based $w$ will out-perform the background $w$. Furthermore, any disagreement between the two forms of $w$ will provide a new test for deviations from the standard model of cosmology.
