Primordial black holes formed in the very early Universe without progenitor stars. They could make up a tiny fraction of dark matter.
This artist's illustration shows what primordial black holes might look like. In reality, the black holes would struggle to form accretion disks. Image Credit: NASA’s Goddard Space Flight Center
Some other form of mass must be present to prevent galaxies from essentially dissipating. Dark matter is a placeholder name for whatever that missing mass may be. Astronomer Fritz Zwicky first used the term in 1933 when he observed theand found indications of missing mass. About 90% of the Coma Cluster is missing mass, which Zwicky called “dunkle Materie.”
In 2015, LIGO detected its first black hole merger. At the time, researchers heralded this new window into the Universe. Until then, astronomical observations were based on electromagnetic radiation, but LIGO/Virgo changed that. This ESA graphic shows how we might discover primordial black holes and help solve the dark matter mystery using the JWST and LISA, the Laser Interferometer Space Antenna. Unfortunately, LISA’s launch is at least a decade away. Image Credit: ESAof PBHs plays a large role in the formation of PBHs. Their goal is to update the mass constraints on PBHs in GW data. “One of our aims is to derive constraints which do not depend significantly on the underlying formation scenario.
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