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> the study shows that dark matter may have been produced before the Big Bang during an era known as the cosmic inflation when space was expanding very rapidly

Er what? I thought inflation was after the Big Bang, eg https://en.wikipedia.org/wiki/Inflation_(cosmology)#/media/F...

I wonder if they mean the cosmic microwave background, rather than the big bang...

I still think this simple explanation is more intriguing than any exotic fever dream particle.

http://www.newtonphysics.on.ca/hydrogen/index.html

Given that that was from 2000, what’s the current thinking? It feels like the sort of thing that 20 years advance in detection and modelling could easily prove / disprove.
Just one of the first links in a Google search: https://www.journals.elsevier.com/molecular-astrophysics/hig... It looks like some people is studding H2, so it is false that (now) everyone is ignoring H2. I think they don't think that H2 is so abundant that it explain most/all the dark matter.
I don't know... Paul Marmet died some time ago, and few are comfortable stepping outside of the big bang consensus.