Originally posted by twhiteheadOne potential problem I see with Macho's is this: if they formed in the first few seconds of the BB what would have prevented them from just being attracted to each other and just be one big black or a smaller number of bigger black holes which would have reduced the overall number to a number that would not be enough to be the distribution we see today.
Here is one argument against black holes.
http://www.businessinsider.com/macho-black-holes-dark-matter-problem-2016-8
Originally posted by sonhouseWhy did that not happen to luminous matter?
One potential problem I see with Macho's is this: if they formed in the first few seconds of the BB what would have prevented them from just being attracted to each other and just be one big black or a smaller number of bigger black holes which would have reduced the overall number to a number that would not be enough to be the distribution we see today.
Originally posted by sonhouseIt depends on the size and when exactly they are supposed to have formed. During inflation the universe expanded very rapidly so gravity really wasn't a factor ie objects just didn't have time to merge. How inflation would affect black holes might be interesting.
One potential problem I see with Macho's is this: if they formed in the first few seconds of the BB what would have prevented them from just being attracted to each other and just be one big black or a smaller number of bigger black holes which would have reduced the overall number to a number that would not be enough to be the distribution we see today.
Originally posted by twhiteheadhttps://en.wikipedia.org/wiki/De_Sitter%E2%80%93Schwarzschild_metric
It depends on the size and when exactly they are supposed to have formed. During inflation the universe expanded very rapidly so gravity really wasn't a factor ie objects just didn't have time to merge. How inflation would affect black holes might be interesting.