Structure formation with PBHs to alleviate early star formation tension revealed by JWST
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Wednesday 10th
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Structure formation with PBHs to alleviate early star formation tension revealed by JWST
This letter explores the potential role of primordial black holes (PBHs) to address cosmological tensions as the presence of more massive than expected galaxies at high redshifts, as indicated by recent James Webb Space Telescope observations. Motivated by inflation models that enhance power at scales beyond the observable range that produce PBHs with Schechter like mass functions, we aim to explain the excess of high redshift galaxies via a modification of the $Lambda$ Cold Dark Matter power spectrum that consists in adding (i) a blue spectral index $n_b$ at $k_{text{piv}}=10/$Mpc and (ii) Poisson and Isocurvature contributions from massive PBHs that only make up $0.5%$ of the dark matter. We simulate these models using the SWIFT code and find an increased abundance of high-redshift galaxies in simulations that include PBHs. We compare these models to estimates from James Webb Space Telescope observations.Unlike the $Lambda$ Cold Dark Matter model, the inclusion of PBHs allows us to reproduce of the observations with reasonable values of star formation efficiency. Furthermore, the power spectra we adopt potentially produce PBHs that can serve as seeds for SMBHs with masses $7.57 times 10^4 M_{odot}$.