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Arxiv: New galaxy UV luminosity constraints on warm dark matter from JWST Published: 4/21/2024 12:32:02 PM Updated: 4/21/2024 12:32:02 PM

Paper abstract: We exploit the recent {\it James Webb Space Telescope} (JWST) determinationof galaxy UV luminosity functions over the redshift range z=9-14.5 to deriveconstraints on warm dark matter (WDM) models. The delayed structure formationin WDM universe makes high redshift observations to be a powerful probe to setlimits on the particle mass m_\mathrm{x} of WDM candidates. By integratingthese observations with blank-field surveys conducted by {\it Hubble SpaceTelescope} (HST) at redshifts z=4-8, we impose constraints on bothastrophysical and WDM parameters simultaneously. We find a new limit ofm_\mathrm{x} >= 3.2 keV for the mass of thermal relic WDM particles at95\% confidence level. This bound is tighter than the most stringent resultderived using HST data before. Future JWST observations could further reducethe observation uncertainties and improve this constraint.