The Cosmic Timeline Implied by the JWST Reionization Crisis
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866909238116220928 |
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| author | Melia, Fulvio |
| author_facet | Melia, Fulvio |
| contents | 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 $R_{\rm h}=ct$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_01581 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Cosmic Timeline Implied by the JWST Reionization Crisis Melia, Fulvio Cosmology and Nongalactic Astrophysics 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 $R_{\rm h}=ct$. |
| title | The Cosmic Timeline Implied by the JWST Reionization Crisis |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2407.01581 |