To the best of my knowledge matter and antimatter black holes cannot be distinguished. Can it be that the supermassive black hole formed from antimatter before the universe cold down enough to form hydrogen atom? Then the matter hydrogen concentered around the black holes and it created the galaxies. This would explain the some part of the missing antimatter and how the galaxy was formed. And it also explains why there is no evidence of the intermediate-mass black holes.
Dear Gergely Nagy Few discrepancies exist in you question...what is black hole? What is antimatter? these two never been observed to this date.
The world made of two kinds of matter unambiguous empirical evidence. One is chemical all of the elements on periodic table that we know. and one non-chemical matter, where we know they are not chemical like dirt.
Read few my article for more detail, don't forget that prediction, assumption and modeling nature is not science as our past icons did.
Dear Javad Fardaei, the black hole is a region of spacetime where gravity is so strong that nothing, including light can escape from it (i.e. the escape velocity exceeds the usual speed of light). The antimatter is like positron, antiquark (antiup, antidown, antitop, antibottom, etc) or complex anitparticles like antiproton but I think the event happened during the quark-gluon plasma phase so there weren’t baryons that time.
I have never heard this chemical, non-chemical division I don’t really understand why it is important.
To the best of my knowledge matter and antimatter collapses into the same black hole if the density is high enough.
Dear Gergely Nagy You're absolutely correct, due to mainstream perception view. But, black hole, spacetime, strong gravity, matter/antimatter, electron/positron proton/neutron, quark antiquark...etc are just theory and up to this none of them never been observed yet.
Unambiguous empirical evidence on Earth show, all matter are chemical elements (periodic table elements) and none chemical elements is dirt on all the surface of earth and moon or any other planets.
Your perception is following last century ideology of modeling, prediction, assumption of unscientific of mechanical universe and atom. While nor universe or atom show mechanical.
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