JWST再电离危机所暗示的宇宙时间线
The Cosmic Timeline Implied by the JWST Reionization Crisis
AI总结：
针对JWST暴露的早期星系、黑洞、PAHs及再电离光子预算异常，本文比较ΛCDM与R_h=ct的再电离历史，证明后者更符合JWST-Planck观测。
摘要：
JWST在大爆炸后仅数亿年就发现了形态完备的星系和超大质量黑洞，并在 z=6.71 处识别出多环芳烃（PAHs），这些结果严重挑战了 ΛCDM 所预测的时间线。如今，Munoz 等人（2024）在 JWST 之后对再电离进行的最新分析得出结论：即使引入非常规修正来改变标准再电离模型，ΛCDM 时间线也根本无法同时容纳 JWST 与 Planck 的联合观测。在本文中，我们认为，这场所谓的“光子预算危机”更可能源于宇宙学模型本身的缺陷。我们采用标准再电离模型，使用 JWST 测量的早期宇宙紫外光度函数，以及 ΛCDM 和 R_h=ct 两种模型中的时间线与物理条件。随后，我们对比这两种情景下预测的再电离历史，并将其与数据进行比较。我们确认，ΛCDM 预测的再电离历史与观测存在显著张力，并证明观测反而与 R_h=ct 时间线高度一致。综合来看，JWST 揭示的四项异常为反对 ΛCDM 预测的时间线、支持 R_h=ct 中的演化历史提供了有力证据。
英文摘要：
JWST's discovery of well-formed galaxies and supermassive black holes only a few hundred Myr after the big bang, and the identification of polycyclic aromatic hydrocarbons (PAHs) at $z=6.71$, seriously challenge the timeline predicted by $Λ$CDM. Now, a recent analysis of reionization after JWST by Munoz et al. (2024) has concluded that the $Λ$CDM timeline simply cannot accommodate the combined JWST-Planck observations even if exotic fixes are introduced to modify the standard reionization model. In this paper, we argue that this so-called `photon budget crisis' is more likely due to flaws in the cosmological model itself. We employ the standard reionization model using the JWST-measured UV luminosity function in the early Universe and the timeline and physical conditions in both $Λ$CDM and $R_{\rm h}=ct$. We then contrast the predicted reionization histories in these two scenarios and compare them with the data. We confirm that the reionization history predicted by $Λ$CDM is in significant tension with the observations, and demonstrate that the latter are instead in excellent agreement with the $R_{\rm h}=ct$ timeline. Together, the four anomalies uncovered by JWST provide strong evidence against the timeline predicted by $Λ$CDM and in favor of the evolutionary history in $R_{\rm h}=ct$.
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