Measuring the growth of structure with intensity mapping surveys
Measuring the growth of structure with intensity mapping surveys
复制标题
DOI：
10.1088/1475-7516/2019/06/025
复制
发表时间：
2019-02
影响因子：
6.4
通讯作者：
E. Castorina;M. White
中科院分区：
文献类型：
--
作者：
E. Castorina;M. White
谱线强度映射为高红移宇宙中宇宙学参数的约束提供了一条新的途径。然而，结构的增长，重力的敏感探针的测量，受到一个众所周知的退化与天体物理参数，编码在特定线的平均亮度温度。在这项工作中，我们将展示如何打破这种简并性，到一个水平，可以允许在百分比水平的宇宙学波动的幅度的约束，使用信息的结构形成的温和的非线性制度所描述的拉格朗日摄动理论。我们把重点放在21厘米线与HIRAX和拟议的第二阶段实验的预测作为例证。
Line intensity mapping offers a new avenue for constraining cosmological parameters in the high redshift Universe. However measurements of the growth of structure, a sensitive probe of gravity, are affected by a well known degeneracy with astrophysical parameters, encoded in the mean brightness temperature of the specific line. In this work we show how to break this degeneracy, to a level that could allow constraints of the amplitude of cosmological fluctuations at the percent level, using information in the mildly non-linear regime of structure formation as described by Lagrangian Perturbation Theory. We focus on the 21-cm line with forecasts for HIRAX and the proposed Stage II experiment as illustrations.