A study by Colgate University researchers published in Physical Review D explores whether gravitational waves detected through pulsar timing arrays could originate from black hole seeds formed in the early Universe. The research connects observations of surprisingly massive black holes found in the young Universe with gravitational wave signals detected billions of years later, suggesting a novel way to probe cosmic dawn.
Pulsar Timing Arrays function by monitoring rapidly spinning neutron stars that act as precise cosmic clocks. When gravitational waves traverse space, they create subtle timing variations in radio pulses received on Earth. International research teams have identified a stochastic gravitational wave background at nanohertz frequencies, widely attributed to pairs of supermassive black holes gradually spiraling toward each other. The most significant contributors are binary systems with combined masses exceeding roughly a billion Suns.
The researchers investigated whether early black hole seeds could persist and evolve into the supermassive black hole binaries generating current gravitational wave signals. They examined two formation pathways: direct collapse black holes and those produced by the collapse of supermassive Dark Stars. Dark Stars are hypothetical primordial objects that would derive energy primarily from dark matter interactions rather than nuclear fusion, potentially growing to masses exceeding a million Suns before collapsing into black holes. Modeling their evolution across cosmic history, the team calculated the gravitational wave background their mergers would generate.
The findings indicate that remnants of supermassive Dark Stars at specific number densities could provide a substantial or dominant contribution to observed pulsar timing array signals. Current measurements thus offer an unexpected ability to constrain the abundance of extremely ancient objects existing more than 13 billion years ago. The work establishes connections between dark matter properties, the formation of primordial objects, supermassive black hole origins, and gravitational wave astronomy, presenting an alternative observational pathway to test Dark Stars’ role in cosmic history.
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