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# Rapidly growing primordial black holes as seeds of the massive high-redshift JWST Galaxies

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Mar 2023

A group of massive galaxies at redshifts of $z\geq 6.5$ have been recentlydetected by James Webb Space Telescope (JWST), which were unexpected to form atsuch early times within the standard Big Bang cosmology. In this work wepropose that the formation of some $\sim 50~M_\odot$ primordial black holes(PBHs) formed in the early Universe via super-Eddington accretion within thedark matter halo can explain these observations. These PBHs may act as seedsfor early galaxies formation with masses of $\sim 10^{9}-10^{10}~M_\odot$ at$z\sim 8$, hence accounting for the JWST observations. We use a hierarchicalBayesian inference framework to constrain the PBH mass distribution models, andfind that the Lognormal model with the $M_{\rm c}\sim 35M_\odot$ is stronglypreferred over other hypotheses. These rapidly growing BHs are expected to havestrong radiation and may appear as the high-redshift compact objects, similarto those recently discovered by JWST.

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