Have astrophysicists finally discovered primordial black holes?

The workings of the Universe.
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Have astrophysicists finally discovered primordial black holes?

Post by fred8615 »

Black holes come in a number of varieties, depending on how they are formed. Conventional black holes form when stars run out of fuel and collapse in on themselves. If the star is massive enough, about three to ten times the mass of our Sun, it forms a black hole.

Another type are the supermassive black holes which sit at the center of many galaxies and are many millions of times more massive than our Sun. There is plenty of evidence of both these types of black holes.

Then there are primordial black holes, much more mysterious objects that are thought to have formed soon after the Big Bang. The thinking is that random fluctuations in the distribution of mass in the early universe must have created some regions dense enough to form black holes.

However, nobody knows if primordial black holes actually exist. Astronomers just haven’t been able to gather the evidence.

Big Bang mystery

That is beginning to change. In 2016, astronomers began operating a gravitational wave detector called LIGO that can measure the way the universe rumbles when two distant black holes collide. Since then, they have spotted 47 collisions between black holes of all kinds of different masses. And that has given them an interesting database to study.

Now the latest analysis suggests that more than a quarter of these collision involved primordial black holes. “If confirmed, these results would imply that the LIGO/Virgo collaboration could have already detected up to 24 binary black holes formed in the early universe,” say Gabriele Franciolini at the University of Geneva and colleagues, who carried out the data analysis. This would be the first observation of any primordial black hole.

Read more: https://astronomy.com/news/2021/05/have ... lack-holes
Frederick J. Barnett
"Someone's got to take the responsibility if the job's going to get done!! Do you think that's easy?!" Gregory Peck - The Guns Of Navarone
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