Scientists believe that in the cores of galaxies, including the Milky Way, there may be one giant invisible star, which consists of a mysterious “fuzzy” dark matter. The size of such a star could be thousands of light years. The study was published on the arXiv preprint server, writes Live Science.

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Scientists have a lot of evidence that most of the mass in any galaxy is invisible dark matter, although it is not entirely clear what it is. One popular theory suggests that dark matter consists of some kind of heavy particle that either rarely or never interacts with light and ordinary matter.. But this theory cannot explain the low density of galactic nuclei, because modeling the behavior of dark matter shows that it should accumulate in the nuclei of galaxies and lead to their high density, but this is not the case.

One solution to this problem is that dark matter consists of very light particles that have a mass billions of times less than the lightest known particle, the neutrino..

Scientists call these particles " That is, these dark matter particles can gather into giant clumps and create dark stars.

It is assumed that such dark stars can be thousands of light years in size, but at the same time their mass is small, because the particles that make them up are very light. Based on this, dark stars can be located in the cores of galaxies, providing most of the mass of these galaxies, but at the same time not creating too much density in their cores.

At the same time, galaxies consist not only of dark matter, but also of ordinary matter, such as gas clouds and stars that can be seen. To test this theory, the study authors decided to understand the connection between fuzzy dark matter and ordinary matter inside the galaxy..

To do this, a simple model of the galaxy was created, which included a large amount of fuzzy dark matter and a small amount of ordinary gas. The authors of the study then calculated how these two components would evolve under the influence of mutual gravity..

The simulation showed that the fuzzy dark matter quickly gathered into a large clump at the center of the galaxy, but was surrounded by scattered dark matter clouds.

Scientists also discovered that ordinary gas mixed with fuzzy dark matter in the galactic core and created a fermion-boson star. This star turned out to be very huge, because its size reached 10,000 light years. At the same time, the star turned out to be almost completely invisible, only the ordinary gas in its composition emitted a little light.

Scientists believe this simulation confirms the theory of fuzzy dark matter that exists in the cores of galaxies.

Now we need to create more complex models to better understand what dark stars in the cores of galaxies might look like so that they can then be detected.

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