JWST's Early Massive Galaxies, Priced: The Baryon-to-Star Conversion Efficiency the Halo Census Permits at z = 10-14
Year: 2026
Type: article
Abstract: Abundance-matching computation of the baryon-to-star conversion efficiency required by headline JWST galaxy candidates at z=10-14 under Planck LambdaCDM with a Sheth-Tormen halo mass function. Spectroscopically confirmed galaxies require epsilon = 0.09-0.21 (at or below the local peak, halo supply margin 82-604x); the extreme photometric envelope (10^10 Msun at z=13) requires epsilon = 2.30 and is impossible as stated, but is fully absorbed by priced systematics (photometric-redshift error -0.59 dex, IMF -0.23 to -0.48 dex, dust/SED -0.40 dex).
Author: Aldred, William Alexander
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7225752677
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