Is dark matter made of primary black holes?

Is dark matter made of primary black holes?

The dwarf irregular galaxy IC1613. Scientists believe that the shapes of faint halo galaxies with halos will help us to understand whether primary black holes can make up dark matter

In the last century, scientists studying the motion of galaxies and the nature of the relic radiation, realized that most of the universal matter remains invisible. Approximately 84% refers to dark matter, most of which is hidden in the halo around galaxies. The name was chosen because matter does not emit light and seems incredibly mysterious: it does not consist of atoms or ordinary components, like electrons and protons.

Astronomers have also observed the effects of black holes and have recently recorded gravitational waves from a colliding pair. Black holes are usually formed at the moment of the explosive death of a massive star. This process can take many hundreds of millions of years. Some black holes could exist in the early Universe, but then there was not enough time to form them. Therefore, they proposed some alternative methods of creation, such as the direct collapse of the primary gas or processes associated with comic inflation. Recently, researchers have suggested that today's dark matter consists of primary black holes. If halos of galaxies are made of black holes, then they should have a density distribution that differs from halos from exotic particles. There are other differences. For example, it is expected that the halo of a black hole is formed earlier in the process of galactic evolution than some other types of halo.

Researchers believe that in the halos of dwarf galaxies you can explore these effects, because this galactic type is weak and tiny. The team conducted a set of computer simulations to check whether it is possible to find the presence of primary black holes in the halo of dwarf galaxies. It turned out that this is possible because it slightly changes the size of the stellar distribution.

The findings also state that for such black holes a mass of 2-14 solar cells is required. But scientists emphasize that these are just guesses and models still do not provide convincing answers.

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