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Are black holes from the Big Bang the dark matter?
The first black holes formed just after the Big Bang, and the researchers have introduced that those black holes are the dark matter. Dark matter has similar features with black holes, and the thing is that both things are not sending the energy or other kinds of radiation away from them. But those objects and particles can be seen by their gravity field.
And this is the reason, why some researchers think that the dark matter has something to do with black holes. But this is only theory, and the fact is that researchers have not a single observation of the dark matter or black hole. There are lots of observations of the things near the singularity. But the singularity itself doesn't send the radiation out of it. The last point where the observation can get is near the point, which is called the event horizon.
The black holes can form giant qubits or data storages, which are stored data from the beginning of the universe. The thing bases the time dilation, which makes it possible that the images are stored at the point, where escaping velocity is the same with the speed of the light can stay until the black hole is vaporizing.
At that point, the escaping velocity is the same with the speed of the light, and if researchers would find the black hole what is formed in the Big Bang, there is a possibility that the information about the history of the universe is stored in that object. At the point of singularity, the time stops. And that means the information is stored like in some giant qubit.
And that data can be download from that qubit if that thing has existed. So the extremely old black holes can give the data of the history of the universe from the beginning to the present. So that kind of thing might revolutionize science, even if black holes don't solve the answer to the dark matter.
The other theories are introducing that the dark matter is the particles, which are smaller than the wavelength of the shortest wave electromagnetic radiation. In that case, those particles cannot be seen by using the normal observation tools like infrared, X-and Gamma-ray, or radio telescopes. Or that the dark matter is the quantum-size black holes or some kind of free gravitons, and the fact is that nobody has seen graviton yet, and that means the gravitons are a good candidate for the dark matter. So when researchers find gravitons, they would find the dark matter.
Sources:
https://www.quantamagazine.org/black-holes-from-the-big-bang-could-be-the-dark-matter-20200923/
Dark matter: https://en.wikipedia.org/wiki/Dark_matter
Graviton:
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