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How heavy is dark matter?
The weight of dark matter is one of the greatest mysteries in the universe. The dark matter weight is a necessary thing for calculating the form and shape of that strange thing. The mass of dark matter is not extremely high or extremely low.
Dark matter is reacting only by gravity and that thing is one of the most remarkable things in the world. There is a piece of evidence that the dark matter is dividing in the universe as the normal material.
Theoretically, there are two types of dark matter.
1) Cold dark matter (CDM)
The Cold Dark Matter is the dominating thing in dark matter. And the dark matter is forming mainly of the CDM. The Cold Dark Matter form in the Big Bang.
And the particles of CDM are moving slowly. The electromagnetic interaction of CDM is minimum. And that explains why we see only the gravitational effect of the cold dark matter.
2) Hot Dark Matter (HDM)
The particles of HDM are traveling with the speed, that is near the speed of light. In some theories, the HDM is simply neutrinos, which could explain the large cosmic structures.
So it makes networks like visible material, but the thing in that kind of idea is basing on observations that one single galaxy has not seem to have dark material at all. So the structure of dark material would be like the cosmic "neural web". But that thing is a purely hypothetical way to think. The mass of dark material would also help to make observations about the dark matter effect on photons. If dark matter has particle forms, that means it should have some kind of interaction with photons.
Does the dark matter the thing, what limits the speed of light? The speed of light is constant what depends on the medium where photons are traveling. So the speed of light is slower in water than in a vacuum. And the speed of light is 90 m/s lower in the atmosphere than in a vacuum. That brings in the mind one question, does dark matter be the thing that acts as a medium that limits the speed of photons to 299 792 458 m/s?
So does the dark matter the reason, why nothing can cross the speed of light? In this hypothesis, dark matter is the thing that denies the particle crossing the cosmic speed limit what is 299792458 m/s. When the particle would accelerate its speed near the speed of the light something starts to cause friction. The Theory of Special relativity tells that nothing can cross the speed of light in a vacuum, but it doesn't tell what causes that effect.
Cherenkov radiation tells that the speed of light can cross in the medium for an extremely short period. And when the particle slows its speed it sends the blue-light shock wave. The speed of light is constant in every medium.
So is in the space some kind of medium that denies the particle cross the speed of light? The fact is that the universe is not a vacuum at all. It's full of electromagnetic radiation and material. So does the dark matter the medium along with the electromagnetic fields limits the speed of the photons?
https://en.wikipedia.org/wiki/Cherenkov_radiation
https://en.wikipedia.org/wiki/Dark_matter
https://en.wikipedia.org/wiki/Speed_of_light
https://scitechdaily.com/how-heavy-is-dark-matter-for-the-first-time-scientists-radically-narrow-the-potential-mass-range/
https://curiosityanddarkmatter.home.blog/2021/01/28/how-heavy-is-dark-matter/
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