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JWST evidence for a sharp "Cosmic Daybreak" at z = 15 — arXiv:2609.28257

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.28257
License (as archived): CC0-1.0
Archived: 2026-10-08T13:18:00.464Z
SHA-256 of the archived text: fec0763cfbbcfecf7d2cc2d81865058a0f64d37f83a7b5885249de739e71aa5d
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How to cite

JWST evidence for a sharp "Cosmic Daybreak" at z = 15 — arXiv:2609.28257 — arXiv (en), https://arxiv.org/abs/2609.28257 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_962ffd5f45fc (Metraipolis archive dc_962ffd5f45fc, sha256 fec0763cfbbcfecf7d2cc2d81865058a0f64d37f83a7b5885249de739e71aa5d)

BibTeX

@misc{dc962ffd5f45fc,
  title = {JWST evidence for a sharp "Cosmic Daybreak" at z = 15 — arXiv:2609.28257},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.28257},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_962ffd5f45fc; sha256 fec0763cfbbcfecf7d2cc2d81865058a0f64d37f83a7b5885249de739e71aa5d},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.28257. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Luminous young galaxies have been uncovered with relative ease by JWST, extending to z=14.5, so it is puzzling that deeper spectroscopy of fainter candidates now finds only interlopers. This redshift `ìmpasse" is underscored by the measured stellar ages of these high-z galaxies, which we show converge to zero by z=15, with a marked absence of earlier star-formation. Taken literally, such a late transition from the Dark Ages to luminous galaxies is unlike the gradual Cosmic Dawn of standard LCDM, but does confirm a key prediction of Wave Dark Matter, $\psi$DM, as a Bose-Einstein condensate. The de Broglie wave pressure resists gravity until a substantial Jeans mass of $4\times 10^9M_\odot$ is overcome at z$=$15, corresponding to a light boson $m_\psi=2.2_{-0.3}^{+0.4} \times 10^{-22}$eV, and similar to independent estimates from lensing anomalies and dwarf galaxies. Furthermore, the substantial luminosities of the highest redshift galaxies appear to converge to the initial Jeans scale of $\psi$DM, whereas LCDM predictions extend to lower luminosities and larger ages than observed. These contrasting predictions can be definitively tested as JWST observations accumulate, with diametric implications for Dark Matter as heavy particles beyond the Standard Model or ultra-light bosons motivated by the String Axiverse.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-24 in astro-ph.CO).
Categorie arXiv: Cosmology and Nongalactic Astrophysics (astro-ph.CO) ; Astrophysics of Galaxies (astro-ph.GA).
Pagina del lavoro: https://arxiv.org/abs/2609.28257 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-08T13:10:03.491Z dalla pagina https://arxiv.org/catchup/astro-ph.CO/2026-09-24?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).