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We exploit the recent James Webb Space Telescope (JWST) determination of galaxy UV luminosity functions over the redshift range z=9-14. 5 to derive constraints on warm dark matter (WDM) models. The delayed structure formation in WDM universe makes high redshift observations to be a powerful probe to set limits on the particle mass mₓ of WDM candidates. By integrating these observations with blank-field surveys conducted by Hubble Space Telescope (HST) at redshifts z=4-8, we impose constraints on both astrophysical and WDM parameters simultaneously. We find a new limit of mₓ 3. 2 keV for the mass of thermal relic WDM particles at 95\% confidence level. This bound is tighter than the most stringent result derived using HST data before. Future JWST observations could further reduce the observation uncertainties and improve this constraint.
Liu et al. (Sun,) studied this question.