What are PBHs?

Exploring the Hypotheticals.

Unlike the black holes we typically study, which form from the gravitational collapse of massive stars, Primordial Black Holes (PBHs) are purely hypothetical objects that would have formed in the extreme density of the very early universe.

Key Difference: Origin

Standard black holes need millions of years for a star to live and die. PBHs would have formed within the first fraction of a second after the Big Bang.

Why do they matter?

Astrophysicists are interested in PBHs for several reasons:

Dark Matter Candidates: If they exist in large enough numbers, they could account for some or all of the dark matter in the universe.
Cosmic Seeds: They might explain how supermassive black holes at the centers of galaxies grew so large so quickly.
Hawking Radiation: Smaller PBHs would be the perfect "laboratories" to observe black hole evaporation.

The Mass Spectrum

Because they didn't form from stars, PBHs aren't restricted by the "Tolman-Oppenheimer-Volkoff" limit. They could theoretically range in mass from a tiny fraction of a gram to thousands of times the mass of our Sun.

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