Theoretically, dark matter could create black holes. But that thing requires that the dark matter exists in the form of particles. And another thing that the form of black holes from dark matter requires is that dark matter exists.
Confirmation that some black hole is formed from the dark matter requires that the black hole is not formed in the collision of neutron stars. So there must not be a neutron star collision at the point, where the black hole is formed.
Or there are no supernova remnants around it. So that kind of black hole should form from emptiness. And a black hole can pull all supernova remnants inside it.
There is also the possibility. That a supermassive black hole forms straight from the interplanetary nebula. In that case, that very massive nebula collapses because there is forming a gravitational center, and then it can form a black hole.
In the same way, a black hole that forms from a neutron star collision should leave some kind of remnant of that event. But that black hole can pull those remnants inside it very fast. So there is no confirmed case where dark matter is suspected to form a black hole. The forming of the black hole from dark matter requires that there is some kind of glimpse that starts to pull dark matter around it. But that kind of black hole seems born from nothingness. So there is no confirmed case that dark matter forms black holes.
Black holes are the most powerful and intensive objects in the universe. There is the possibility that dark matter can form black holes. And the singularity material where space and time are together is the third state of matter. But that matter can exist only in the black holes, where the gravitation pulls even light inside it.
The fact is that gravitation is the only known interaction between visible and dark matter. There are galaxies there is no dark matter at all. And that makes the dark matter mystery more complicated than it should. The galaxies are giant transition disks around supermassive black holes.
The born of a galaxy requires that the centripetal force will not rip the material disk around its center into pieces. So the mass of the center of the galaxy should be higher than the centripetal force that pulls objects away from it. And of course, we can think that the dark matter dropped into the black hole that forms the galaxy.
But in intensive gravitation, the material turns to a form that we can call a singularity. In singularity, the time and material are together. So that means the material that the dark and visible materials can form the same material. But that material exists only in the black holes. That material could have an ability to interact with both material forms dark and visible materials.
The fact is that the form of dark matter is interesting. There is no other known interaction between dark and visible material than gravitation. So the theories about the black holes that are forming of dark matter are theories. The thing is that. We don't know can dark matter form any kind of black hole. There are theories that dark matter can be the virtual particles that are forming when gravitational waves are impacted together.
Those impacts will rise the power of gravitational waves because gravitation is wave motion. And wave motion should always behave similar way. But there is one very interesting vision about the form of the gravitational waves. And that is if those gravitational waves are strong enough, they could form a black hole. But that thing requires extremely powerful gravitational waves.
https://bigthink.com/starts-with-a-bang/black-holes-dark-matter/
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