Curious gravitational wave may be hint at primordial black holes—or just noise: Astronomers approach unusual observation with caution and excitement.

The article discusses a potential observation of primordial black holes, which may have formed shortly after the Big Bang, as detected by the Laser Interferometer Gravitational-Wave Observatory (LIGO) and its European counterpart, Virgo. On November 12, an alert was issued for a merger involving at least one object that is too light to be a typical black hole or neutron star, raising the possibility of primordial black holes, although experts caution that the signal could be noise. The detection of such a merger would be significant, as it could provide evidence for a population of primordial black holes, which some theorists suggest could account for dark matter. However, the high false alarm rate associated with this alert and the lack of accompanying observable phenomena make the confirmation of this event uncertain. [Extracted from the article]