Intermediate-mass black holes creation theory.

"A groundbreaking study provides fresh insights into the origins of intermediate-mass black holes (IMBHs). By conducting the first-ever simulations of individual stars in a forming globular cluster, researchers have identified potential mechanisms through which these dense star clusters could give rise to IMBHs. Credit: SciTechDaily.com" (ScitechDaily, Cosmic Forge: The Creation of Intermediate-Mass Black Holes in Dense Star Clusters)

The intermediate-mass black holes (IMBH)are one "they should exist", but nobody found them. The term IMBH means a black hole. Whose mass is between 10^2 to 10^5 suns. That is between stellar and supermassive black holes. There are several IMBH candidates. But nobody found the 100% confirmed IMBH object. 

Theoretically, the stellar mass black holes all can form when the massive star detonates as a supernova. Or if the star is too big and too massive. It can fall into a black hole without a supernova explosion. In that case. The extremely heavy hydrogen star will expand, and its nuclear reaction will turn too weak that it can resist gravity.

 If the star is pure hydrogen. Radiation pushes those atoms out of each other. They can form the quantum channels between hydrogen atoms. Those quantum shadows can pull those atoms together. And form the large area fusion in the blue supergiant. And that can turn them into black holes. 

In the third version, the stellar-mass black holes can form when outcoming energy hits the star. The outcoming energy impulses can transform smaller stars into black holes. 

Stars in globular clusters are usually old metal-poor stars. But there are also things like young blue stars. The old stars are yellow giants. And in some cases, they are Wolf-Rayet (WR) stars. In dense globular clusters.  The intensive interaction between stars can raise their surface temperature very high, even if those stars are not the hottest possible. 

And if the stars are in very dense star clusters. The stars in the shell of that globular cluster send energy into the central stars that are the most massive in those clusters. The energy flow affects those stars in the middle of the globular cluster. And raise their energy level to a higher level, than it should. This thing causes a situation in that star. That fusion can begin in the larger areas of the star than usual. 

The fusion that begins, near the shell of those stars can turn them into black holes. or otherwise, that extra energy just detonates those massive stars as supernovas. When the star explodes in the dense cluster. That shockwave can also affect other stars very strongly. And that thing makes it possible for a supernova explosion to launch more supernova explosions. That forms a cluster of black holes that can impact each other. 

It's possible. At least some quasars formed around the Kugelblitz black holes. Those Kugelblitz black holes can exist in extremely stable conditions. 

The supermassive black holes can form when some interplanetary or interstellar nebula collapses. It's possible. Things like still hypothetical Kugelblitz black holes can form the disturbance that can cause a situation in which the extremely. Massive hydrogen clouds and electromagnetic fields can fall into the supermassive black holes. 

When some plasma jet or high-energy particle travels through that hydrogen cloud, it makes a hole in the cloud. The hydrogen atoms travel into that hole, and if there is no disturbance that thing starts to pack those hydrogen atoms into one place. And they can form a gravity center that pulls all material into it.  

The electromagnetic radiation forms the kugelblitz-black hole through the whirl. The requirement for the Kugelblitz black hole creation is a very stable environment. If there is too much turbulence. That destroys this structure immediately. The internal energy level in the whirl must be so high that the whirl doesn't break. 

And then in that model, it collects energy from its environment.  The electromagnetic whirl forms when some particle travels through the molecular clouds and electromagnetic fields can start to turn stronger. And it rolls other quantum or electromagnetic fields around it. That can explain why there are no supermassive black holes created in galaxies. Except in their center. Supermassive black holes are in every galaxy center and quasars. 

https://scitechdaily.com/cosmic-forge-the-creation-of-intermediate-mass-black-holes-in-dense-star-clusters/

https://en.wikipedia.org/wiki/Giant_star

https://en.wikipedia.org/wiki/Globular_cluster

https://en.wikipedia.org/wiki/Quasar

https://en.wikipedia.org/wiki/Stellar_classification

https://en.wikipedia.org/wiki/Supermassive_black_hole

https://en.wikipedia.org/wiki/Wolf%E2%80%93Rayet_star