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Simulations suggest JWST's little red dots may be rapidly growing black holes

ScienceDaily reports that supercomputer simulations led by Sunmyon Chon indicate JWST's Little Red Dots may be black holes growing dozens of times faster than possible today, though the objects remain unidentified.

Updated Sep 17, 2026 · 14:26 UTC1 reports

The short version

  • Simulations led by Sunmyon Chon of the Max Planck Institute for Astrophysics used Japan's ATERUI III supercomputer to model conditions in the early Universe from galactic scales down to individual gas clouds.[ScienceDaily]
  • In the model, intense far-ultraviolet radiation from nearby galaxies suppresses ordinary star formation, letting gas collapse into a single supermassive star that can leave behind a black hole seed.[ScienceDaily]
  • Dense gas disks around those seeds trap radiation and allow growth dozens of times faster than today, and the simulated objects closely resemble JWST's Little Red Dots.[ScienceDaily]
  • If the interpretation holds, it could explain how supermassive black holes existed less than 600 million years after the Big Bang, but the dots' true identity is not established.[ScienceDaily]

Key facts

  • The research was led by Sunmyon Chon of the Max Planck Institute for Astrophysics, using the ATERUI III supercomputer at the National Astronomical Observatory of Japan.[ScienceDaily]
  • In the simulations, far-ultraviolet radiation from nearby galaxies prevents ordinary star formation, allowing gas to collapse into a single supermassive star that can form a black hole seed.[ScienceDaily]
  • Dense gas disks surrounding the simulated seeds trap radiation and permit growth dozens of times faster than would be possible today.[ScienceDaily]
  • The simulated objects closely resemble the Little Red Dots observed by JWST, suggesting they could represent an early stage of extremely rapid black hole growth.[ScienceDaily]
  • Some supermassive black holes contain millions or billions of times the Sun's mass and already existed less than 600 million years after the Big Bang.[ScienceDaily]
  • The model required no unusual physics or highly unlikely events, which could help explain why Little Red Dots appear common in JWST observations.[ScienceDaily]

What remains uncertain

  • The identity of the Little Red Dots is unconfirmed; the simulations suggest they could be rapidly growing black holes but do not establish that.[ScienceDaily]
  • The explanation rests on computer modeling of early-Universe conditions rather than direct observation of the objects.[ScienceDaily]

Sources

Outlet counts describe coverage, not independent confirmation. Reports may share a wire service or original source.