Influence of supermassive primordial black holes on ultraviolet luminosity of high-redshift galaxies

Abstract

Recently James Webb Space Telescope (JWST) have observed an excess of luminous galaxies at high redshifts ($z \gtrsim 10$). In this work, we investigate whether supermassive primordial black holes (SMPBHs) can explain it by their influence on the ultraviolet luminosity function (UV LF) of high-redshift galaxies. Through Markov Chain Monte Carlo analysis, we constrain the parameters relevant with SMPBHs against current JWST observational data. The results reveal that SMPBHs with masses $M_{\rm PBH} \sim 10^{6.3\text{-}8.3} M_\odot$, abundances $f_{\rm PBH} \sim 10^{-7}\text{-}10^{-5}$, and sub-Eddington ratios $\lambda_E \ll 1$ can effectively enhance the bright end of the UV LF, consistent with JWST observations.