论文标题
通过星系的内在比对改善宇宙学的几何和动态约束
Improving geometric and dynamical constraints on cosmology with intrinsic alignments of galaxies
论文作者
论文摘要
我们表明，在星系红移调查中测量的星系内在比对（IAS）的空间相关性提供了改善宇宙学的几何和动态约束的精确途径。 IA已被视为针对宇宙学探针（例如弱重力透镜实验）的污染物。但是，IAS的大规模相关性有望遵循连贯的大规模物质不均匀性。在这里，利用其各向异性性质，我们表明大规模的IA相关性有助于改善几何距离和结构生长的测量。结合常规的星系群集统计，我们发现，与单独的聚类统计数据相比，黑暗能量和哈勃参数的状态方程参数的约束可能更紧密，仅比仅1.5倍以上。
We show that the spatial correlation of the intrinsic alignments (IAs) of galaxies, measured in galaxy redshift surveys, offers a precision route to improve the geometrical and dynamical constraints on cosmology. The IA has been treated as a contaminant against cosmological probes such as weak gravitational lensing experiments. However, the large-scale correlation of IAs is expected to follow the coherent large-scale matter inhomogeneities. Here, making use of its anisotropic nature, we show that the large-scale IA correlations help to improve the measurements of the geometric distances and growth of structure. In combination with the conventional galaxy clustering statistics, we find that constraints on equation-of-state parameter for dark energy and Hubble parameter can be tighter than those from the clustering statistics alone by a factor of more than 1.5.
