Title: Elucidating Dark Energy with Future 21 cm Observations at the Epoch of Reionization Show Chinese title

Title: 揭示再电离时代未来21厘米观测中的暗能量

Abstract: We investigate how precisely we can determine the nature of dark energy such as the equation of state (EoS) and its time dependence by using future observations of 21 cm fluctuations at the epoch of reionization (6.8 <~ z <~ 10) such as Square Kilometre Array (SKA) and Omniscope in combination with those from cosmic microwave background, baryon acoustic oscillation, type Ia supernovae and direct measurement of the Hubble constant. We consider several parametrizations for the EoS and find that future 21 cm observations will be powerful in constraining models of dark energy, especially when its EoS varies at high redshifts. Show Chinese abstract

Abstract: 我们研究如何通过利用再电离时期（6.8 <~ z <~ 10）21厘米波动的未来观测，如平方公里阵列（SKA）和全向望远镜，结合宇宙微波背景、重子声学振荡、Ia型超新星和哈勃常数的直接测量，精确确定暗能量的性质，如状态方程（EoS）及其时间依赖性。我们考虑了几种状态方程的参数化方法，并发现未来的21厘米观测将非常有力地限制暗能量模型，尤其是在高红移时其状态方程发生变化的情况下。