The debate about what exactly is dark matter, do not cease till now. And although its existence there can be little doubt, and according to some calculations, the amount of dark matter is more than 80% of the Universe, to find it extremely difficult. But why, if dark matter so much, find it so difficult? Think of astrophysics from Stanford University found out the answer to this question.
What is dark matter?
For the beginning it would be nice to understand what constitutes dark matter. If you try to explain in simple language, that even physicists still don’t know what she looks like. But the fact that it is not necessary to know how something looks to prove that it is. Approximately of these assumptions came Stephen Hawkingstudying black holes. And he has achieved great success.
This is interesting: Can dark matter produce dark life?
However, some understanding of dark matter is still available. This mysterious substance is almost not interacting with ordinary particles. It does not “come into contact” with it and photons (and emit not pagasae light), and therefore to see her we can’t as to ensure that the object has become visible, it needs to somehow react to the presence of photons. However, there is one force that interacts with dark matter. And her name was “gravity”. On this basis, the main candidates for dark matter can be wimpy — particlesthat cannot participate in any form of interaction, except gravitational. Their existence is proven in plenty of scientific works, but to wimpy experimentally (including at the Large hadron Collider) has not yet happened.
Why is it so difficult to detect dark matter?
To answer this question, experts from Stanford University and SLAC National laboratory conducted a simulation of the Universe filled with dark matter. In this case the dark matter attributed to the different properties. Next, the results are imposed on the known structure of satellite galaxies of the milky Way. In these structures, according to scientists, and there should be dark matter.
In the end it turned out that the coincidence of the reconstructed model and the real structures is maximized when the dark matter has the lowest mass, and (according to theoretical models) moves and manifests gravitational interaction with matter is much weaker than previously thought.
In other words, dark matter particles (no matter how they looked) have very different characteristics than previously thought. For example, the strength of the gravitational interaction in experimental models was approximately 1000 times weaker than people think now. This may explain why none of the many experiments aimed at detecting dark matter have not yet been crowned with success.
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