Primordial black holes may have emerged from extreme density fluctuations in the first fractions of a second. Unlike stellar black holes, they didn’t require collapsing stars. They could range from microscopic to massive sizes, influencing cosmic evolution. Some might even contribute to dark matter. Detecting them is extremely challenging, but their existence could explain phenomena like unusual gravitational lensing. These cosmic relics are a direct window into the universe’s earliest moments.
It matters because primordial black holes could solve mysteries about dark matter.
It also links early-universe physics to observable cosmic phenomena today.
Tiny black holes may have formed before stars even existed.
CERN [cern.ch]