论文标题
探索对模糊暗物质21厘米标志的延迟和加热效果
Exploring delaying and heating effects on the 21-cm signature of fuzzy dark matter
论文作者
论文摘要
在模糊的暗物质（FDM）模型中，暗物质由$ \ sim $ kpc的超光颗粒组成，其表现就像冷暗物质（CDM）。因此，FDM抑制了小尺度上结构的生长，这延迟了宇宙黎明（CD）的发作和随后的电源时期（EOR）。这留下了天空中的潜在签名，平均21厘米信号（全局）以及21厘米波动，可以通过持续和未来的21 cm全球和强度映射实验来寻求。为了可靠地这样做，至关重要的是包括诸如深色 - 消息/巴属相对速度和Lyman-Werner恒星形成反馈之类的效果，这也是延迟机制，以及CMB和\ lya供暖效果，这些效果可以显着改变信号的幅度和时机，这取决于X射线的强度，该恒星的强度是由X射线加热的强度。在这里，我们使用公共代码的修改版本21CMVFast对FDM宇宙学中的21 cm信号进行了对所有这些额外效果的修改版本，并直接与Boltzmann代码类接触，从而可以充分探索宇宙学和天体学参数之间的脱色器。我们研究了可通过强度映射实验（例如HERA和EDGE）等强度映射实验（例如Edges）来区分CDM和FDM模型以及预测关节天体，宇宙和FDM参数约束的前景。我们发现HERA将能够检测到最高$ m _ {\ rm fdm} \！ \ sim \！10^{ - 19} \，{\ rm ev} \！ - \！10^{ - 18} \，{\ rm ev} $，取决于前景假设，尽管延迟和加热机制的效果减轻了，分析中包含的延迟和加热机制也有缓解的效果。
In the fuzzy dark matter (FDM) model, dark matter is composed of ultra-light particles with a de Broglie wavelength of $\sim$kpc, above which it behaves like cold dark matter (CDM). Due to this, FDM suppresses the growth of structure on small scales, which delays the onset of the cosmic dawn (CD) and the subsequent epoch of reionization (EoR). This leaves potential signatures in the sky averaged 21-cm signal (global), as well as in the 21-cm fluctuations, which can be sought for with ongoing and future 21-cm global and intensity mapping experiments. To do so reliably, it is crucial to include effects such as the dark-matter/baryon relative velocity and Lyman-Werner star-formation feedback, which also act as delaying mechanisms, as well as CMB and \lya heating effects, which can significantly change the amplitude and timing of the signal, depending on the strength of X-ray heating sourced by the remnants of the first stars. Here we model the 21-cm signal in FDM cosmologies across CD and EoR using a modified version of the public code 21cmvFAST that accounts for all these additional effects, and is directly interfaced with the Boltzmann code CLASS so that degeneracies between cosmological and astrophysical parameters can be fully explored. We examine the prospects to distinguish between the CDM and FDM models and forecast joint astrophysical, cosmological and FDM parameter constraints achievable with intensity mapping experiments such as HERA and global signal experiments like EDGES. We find that HERA will be able to detect FDM particle masses up to $m_{\rm FDM}\! \sim \!10^{-19}\,{\rm eV}\!-\!10^{-18}\,{\rm eV}$, depending on foreground assumptions, despite the mitigating effect of the delaying and heating mechanisms included in the analysis.
