模拟的最小尺寸为21 cm
Minimum size of 21-cm simulations
摘要：
宇宙21厘米干涉测量将彻底改变我们对再电离时代（EoR）和宇宙黎明（CD）的理解。然而，信号的结构范围很广，需要大型模拟箱来统计相关字段。在这项工作中，我们量化的最小盒子大小模拟宇宙21厘米信号的功率谱（PS）。我们执行初始条件的多个实现，对于一系列的框大小。我们量化收敛相对于箱长1.1 Gpc的模拟观测，与SKA 1-低的1000小时观测计算的热噪声。我们发现，盒长度200-300 Mpc的模拟低估了CD期间的大规模功率平均约7- 9%。我们得出结论，需要$L\gtrsim250$ Mpc的盒长度收敛在总噪声的<~1 $σ$的水平。
英文摘要：
Cosmic 21cm interferometry is set to revolutionize our understanding of the Epoch of Reionization (EoR) and the Cosmic Dawn (CD). However, the signal has structure on a huge range of scales, requiring large simulation boxes to statistically capture the relevant fields. In this work we quantify the minimum box size for simulating the power spectrum (PS) of the cosmic 21cm signal. We perform multiple realizations of the initial conditions, for a range of box sizes. We quantify convergence with respect to a mock observation of box length 1.1 Gpc, with thermal noise computed for a 1000h observation with SKA1-low. We find that simulations of box lengths 200-300 Mpc underestimate the large-scale power during the CD by ~7-9 % on average. We conclude that box lengths of $L\gtrsim250$ Mpc are needed to converge at the level of <~1$σ$ of the total noise.
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