用21厘米信号关闭模糊暗物质的窗口
Closing the window on fuzzy dark matter with the 21cm signal
摘要：
模糊暗物质（FDM）是暗物质（DM）的一个很好的候选者，因为它的小质量和大的de-Broglie波长抑制小尺度物质波动，从而解决了$Λ$ CDM中的一些小尺度差异。虽然它已被排除为DM的单个分量，但在FDM参数空间（“FDM窗口”，$10^{-25}\,\mathrm{eV}\lesssim m_\mathrm{FDM}\lesssim10^{-23}\,\mathrm{eV}$）中仍有一个区域允许FDM包括总DM的大部分。在这项工作中，我们第一次研究了FDM（由超轻轴子组成）在21厘米信号上的分数小于1的签名及其可探测性，21厘米干涉仪如HERA，考虑到天体物理和宇宙学参数的简并性，使用一个新的管道，结合修改版本的CAMB和21厘米FAST代码。我们的预测意味着，HERA在其设计性能将是敏感的FDM分数小到1%的FDM窗口，并提高了现有的界限，其他群众高达一个数量级。
英文摘要：
Fuzzy dark matter (FDM) is a well motivated candidate for dark matter (DM) as its tiny mass and large de-Broglie wavelength suppress small-scale matter fluctuations, thereby solving some of the small-scale discrepancies in $Λ$CDM. Although it has been ruled out as the single component of DM by several observables, there is still a region in the FDM parameter space (the "FDM window", $10^{-25}\,\mathrm{eV}\lesssim m_\mathrm{FDM}\lesssim10^{-23}\,\mathrm{eV}$) where FDM is allowed to comprise a large portion of the total DM. In this work, for the first time, we study the signature of FDM (comprised of ultra-light axions) in fractions less than unity on the 21cm signal and its detectability by 21cm interferometers such as HERA, taking into account the degeneracy with both astrophysical and cosmological parameters, using a new pipeline that combines modified versions of the CAMB and 21cmFAST codes. Our forecasts imply that HERA in its design performance will be sensitive to FDM fractions as small as 1% in the FDM window, and improve over existing bounds for other masses by up to an order of magnitude.
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