A new idea for how dark matter came to dominate the universe

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fred8615
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A new idea for how dark matter came to dominate the universe

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Eighty-five percent of the matter in the universe is thought to be "dark" matter invisible to humans and our scientific instruments. But scientists don't know what dark matter is made of or how it was created in the early universe.

Now, a group of researchers has proposed a new recipe for the mysterious substance: a dark matter particle colliding with an ordinary matter particle and transforming it into a new dark matter particle. This process would have continued until the universe settled at the amount of dark matter present today.

"There are zillions of models to explain dark matter," said Torsten Bringmann, a physicist at the University of Oslo in Norway and one of the authors of the new paper, published in November in the journal Physical Review Letters. "If you write down a model, it should contain a mechanism of how to produce dark matter, how to explain the one thing we know about dark matter -- namely, exactly how much there is."

Scientists know dark matter must exist in part because the outer edges of galaxies are spinning faster than expected -- so fast that, based on the amount of ordinary matter in galaxies, galaxies should rip apart. But fortunately for us, they still exist. So, there must be some unseen matter helping to hold them together.

Dark matter has also been indirectly observed in clusters of galaxies, which also shouldn't hold together, as well as in fluctuations in radiation from the early universe known as the cosmic microwave background.

"It's pretty much convincing that there is some form of dark matter in the universe, and that it actually forms a very important component of matter," said Geneviève Bélanger, a physicist at the Annecy-le-Vieux Laboratory of Theoretical Physics in France, who did not contribute to the new paper.

Read more: https://astronomy.com/news/2022/03/a-ne ... e-universe
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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