再电离后用21厘米观测精确测量宇宙学功率谱的可能性
Possibility of Precise Measurement of the Cosmological Power Spectrum With a Dedicated 21cm Survey After Reionization
摘要:
测量再电离后剩余宇宙氢的21厘米谱线发射,可以用来追踪宇宙可观测体积中相当一部分的密度扰动功率谱。我们表明,一个专门的21厘米的天文台coule探针的独立模式,是两个数量级大于目前可用的,并使宇宙方差有限的中微子质量~0.05eV的签名检测。线性增长因子随红移的演化也可以将引力或暗能量的奇异理论限制到前所未有的精确度。
英文摘要:
Measurements of the 21cm line emission by residual cosmic hydrogen after reionization can be used to trace the power spectrum of density perturbations through a significant fraction of the observable volume of the Universe. We show that a dedicated 21cm observatory coule probe a number of independent modes that is two orders of magnitude larger than currently available, and enable a cosmic-variance limited detection of the signature of a neutrino mass ~0.05eV. The evolution of the linear growth factor with redshift could also constrain exotic theories of gravity or dark energy to an unprecedented precision.
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