Early Galaxies from Rare Inflationary Processes and JWST Observations
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910827077959680 |
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| author | Kumar, Soubhik Weiner, Neal |
| author_facet | Kumar, Soubhik Weiner, Neal |
| contents | Rare Poisson processes (PP) during cosmic inflation can lead to signatures that are localized in position space and are not well captured by the standard two- or higher-point correlation functions of primordial density perturbations. As an example, PP can lead to localized overdense regions that are far denser than the ones produced through standard inflationary fluctuations. As a result, such overdense regions collapse earlier than expected based on the standard $Λ$CDM model and would host anomalously high-redshift galaxies. We describe some general aspects of such PP and consider a particular realization in the context of inflationary particle production. We then show that the masses and redshifts of the resulting galaxies can lie in a range discoverable by the James Webb Space Telescope (JWST) and future surveys, while being consistent with existing constraints on the matter power spectrum and UV luminosity functions at lower redshifts. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_08701 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Early Galaxies from Rare Inflationary Processes and JWST Observations Kumar, Soubhik Weiner, Neal Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Physics - Phenomenology Rare Poisson processes (PP) during cosmic inflation can lead to signatures that are localized in position space and are not well captured by the standard two- or higher-point correlation functions of primordial density perturbations. As an example, PP can lead to localized overdense regions that are far denser than the ones produced through standard inflationary fluctuations. As a result, such overdense regions collapse earlier than expected based on the standard $Λ$CDM model and would host anomalously high-redshift galaxies. We describe some general aspects of such PP and consider a particular realization in the context of inflationary particle production. We then show that the masses and redshifts of the resulting galaxies can lie in a range discoverable by the James Webb Space Telescope (JWST) and future surveys, while being consistent with existing constraints on the matter power spectrum and UV luminosity functions at lower redshifts. |
| title | Early Galaxies from Rare Inflationary Processes and JWST Observations |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2502.08701 |