Growth of Light Seed Black Holes in the Early Universe

Abstract

Observations from the James Webb Space Telescope (JWST) have uncovered supermassive black holes (SMBHs) with masses exceeding $10^6{\mathrm{M}}_{\odot }$ at redshifts $z>8$, posing significant challenges to existing models of early black hole formation and growth. Here we show, in a fully cosmological setting, that light seed black holes (LSBHs), remnants of Population III stars, can grow rapidly to $\sim 10^4{\mathrm{M}}_{\odot }$ in the early Universe. This growth is enabled by our novel black hole seeding prescription and the unprecedented resolution of our zoom-in cosmological simulations, which resolve the dense environments necessary for efficient accretion. Our results provide robust evidence that LSBHs can attain the masses required to serve as the dominant progenitors of the SMBH population observed at later cosmic epochs. These findings have far-reaching implications for the interpretation of JWST observations and future gravitational wave detections with LISA.

arXiv comment16 pages, 4 figures, 8 extended data figures. Published in Nature Astronomy

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Cited by in corpus (1)

• The In Situ Growth of Stellar-mass "Light" Seed Black Holes in Nuclear Star Clusters