论文标题
用21cm信号关闭模糊暗物质的窗户
Closing the window on fuzzy dark matter with the 21cm signal
论文作者
论文摘要
模糊的暗物质（FDM）是一个有动力的暗物质（DM）的候选人，因为其微小的质量和大型的de-broglie波长抑制了小规模的物质波动，从而解决了一些小规模差异，以$λ$ cdm的范围。尽管已被几个可观察结果排除了DM的单个组成部分，但FDM参数空间中仍然存在一个区域（“ FDM窗口”，$ 10^{ - 25} \，\ Mathrm {ev} \ Mathrm {ev} \ simsim m_ \ simsim m_ \ mathrm mathrm {fdm} {fdm} \ simsim fimsim10^iS fim fims fim frim）为了占总DM的大部分。在这项工作中，我们首次研究了馏分的FDM（由超光轴组成）的签名，而在21厘米信号上的统一性及其可检测性（例如HERA）（例如HERA）（例如HERA），考虑到与天体物理和宇宙学参数的退化，使用了新的管道，使用了新的管道来结合Modifiend camb和21c的camb和21c。我们的预测表明，HERA的设计性能将对FDM窗口中的FDM分数敏感，而FDM窗口中的FDM分数则小至1％，并提高了其他群众的现有界限，最多可达一定的数量级。
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.
