Dark holes

[Philip Thrift]

Black Holes From the Big Bang Could Be the "Dark Matter"

https://www.quantamagazine.org/black-holes-from-the-big-bang-could-be-the-dark-matter-20200923/

ref:

Primordial black hole dark matter and the LIGO/Virgo observations

https://iopscience.iop.org/article/10.1088/1475-7516/2020/09/022

@philipthrift

[Lawrence Crowell]

There are to my mind problems with these ideas. Microlensing put some hard limits on the abundance of hidden black holes as dark matter. The other problem is the inflationary period is not a time where BH formation would be at all favored. Afterwards, maybe .... , but it is still hard for the world was pretty homogeneous. 

I think the best candidate for these 30 to 60 solar mass black holes are pop-III stars. These were the first stars composed of largely transparent hydrogen. These stars might be a sort of hyper-star Feynman and Wheeler considered with a black hole in their center. These may have then served to fuse a lot of material and generate heavier elements. The interior black hole is initially formed as the hydrogen does not scatter the radiation back much, but where after the BH forms there is an accretion disk with fusion that both generates heavier elements and feeds the BH. What is left are these intermediate mass black holes.

LC