The debate about what dark matter isstill subside. And although there is almost no doubt about its existence, and according to some calculations, the amount of dark matter is more than 80% of the Universe, to find it extremely difficult. But why, since dark matter is so much, is it so difficult to find? It seems that astrophysics from Stanford University found out the answer to this question.
What is dark matter?
For the beginning it would be nice to understand thatrepresents dark matter. If you try to explain in simple language, even physicists still do not know what it looks like. But the fact is that it is not necessary to know how something looks to prove that it is. Approximately from such premises and proceeded Stephen Hawking, studying black holes. And he achieved considerable success in this.
It is interesting: Can dark matter give rise to a dark life?
However, some understanding of the darkmatter still there. This mysterious substance almost does not interact with ordinary particles. At the same time, it does not “come into contact” with photons (it does not emit or absorb light), which means we cannot see it, because in order for an object to become visible, it must at least somehow react to the presence of photons . However, there is one force that interacts with dark matter. And her name is "gravity." Based on this, the main candidates for the role of dark matter may be Wimps - particles that cannot participate in any kind of interaction, except gravitational. Their existence has been proven in the mass of scientific works, but it has not yet been possible to experiment experimentally (including at the Large Hadron Collider).
Why is it so difficult to detect dark matter?
To answer this question, experts fromStanford University and the SLAC National Laboratory conducted a simulation of a part of the universe filled with dark matter. In this case, dark matter attributed a variety of properties. Further, the results were imposed on the known structures of the Milky Way satellite galaxies. It is in these structures, according to scientists, that dark matter should be located.
As a result, it turned out that the coincidence is recreatedmodels and real structures were maximal when dark matter has the lowest mass, and also (according to theoretical models) it moves and manifests gravitational interaction with matter much weaker than previously thought.
In other words, particles of dark matter (how would theydid not look) have completely different characteristics than previously thought. For example, the force of gravitational interaction in experimental models was about 1000 times weaker than is commonly thought now. This may explain why none of the many experiments aimed at detecting dark matter, has so far been unsuccessful.
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