A new study proposes using gravitational wave signals from binary black hole mergers to learn about Population III stars, the first generation of stars that formed in the early universe.
. These events occur when massive objects like neutron stars and black holes merge, sending ripples through spacetime that can be detected millions of light-years away. Since the first event, more than 100 GW events have been confirmed by LIGO, the, an international team of astronomers proposed another application for binary black hole mergers: using the earliest mergers in the Universe to probe the first generation of stars in the Universe.
This led to the major phase transition that ended the Cosmic Dark Ages , allowing the Universe to become “transparent” as it is today. However, as Liu stated, how this process started remains unclear: The question is, how do two black holes get so close to each other that they will eventually merge? Astronomers currently rely on two evolutionary “channels” to model this process: and nuclear star cluster-dynamical hardening . As Liu indicated, the resulting BBH mergers have distinct features in their merger rate and properties, depending on the channel they follow. They contain valuable information about the underlying physical processes.
Gravitational Waves Black Holes Early Universe Population III Stars Cosmic Dawn
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