Dark stars may have seeded the universe's first supermassive black holes

Researchers from Colgate University propose that hypothetical "dark stars" in the early universe served as the primordial seeds for supermassive black holes. This theory offers a solution to a growing chronological mystery: how the universe's largest black holes formed so quickly after the Big Bang.

According to the study published in Physical Review D on August 17, 2026, these theoretical primordial stars were not powered by nuclear fusion like modern stars. Instead, they were fueled by self-annihilating dark matter in their cores. This unique energy source allowed dark stars to grow to immense proportions, potentially reaching masses millions of times that of the sun before eventually collapsing into massive black hole seeds.

The Chronological Discrepancy

This proposal addresses a significant gap in current astrophysical models. Standard theories of black hole growth suggest that feeding on gas and merging with other black holes takes over a billion years to produce a supermassive entity. However, data from the James Webb Space Telescope (JWST) has routinely detected supermassive black holes existing well before the universe reached its first billion years of age.

By starting with "heavy seeds" created by the collapse of dark stars, the timeline for black hole growth is drastically shortened. This allows the massive objects observed by JWST to exist without violating the known laws of physics or requiring impossible growth rates.

Gravitational Echoes

Beyond explaining the size of early black holes, the research links these ancient objects to modern observations. The team suggests that the low-frequency gravitational wave background detected in 2023 via pulsar timing arrays may contain the imprint of these dark star remnants.

"Their descendants could leave a gravitational-wave imprint that persists all the way to the present-day universe," said Cosmin Ilie of Colgate University. The researchers believe that the mergers of these massive seeds contributed significantly to the gravitational wave signals currently being measured.

Implications for Cosmic Dawn

If confirmed, this theory transforms the study of gravitational waves. Rather than simply observing recent binary black hole mergers, scientists could use these signals as a window into the birth of the first supermassive black holes at the dawn of time.

However, the model requires a precise balance of these primordial objects. Sohan Ghodla of Colgate University noted that producing too many massive seeds would over-produce the signal detected by pulsar timing arrays, while producing too few would leave the theory unable to explain the rapid assembly of supermassive black holes.

What's Next

Astronomers will now look to further correlate pulsar timing array data with the specific signatures predicted by the dark star model. While the existence of dark stars remains theoretical, the ability to match their predicted gravitational echoes with observed data offers a tangible path toward verifying their existence and solving the mystery of the early universe's giants.