B Half of the Universe’s ordinary matter may have been found

[gmax137]

TL;DR Summary

The long-sought matter appears to have been hiding in the gaps between galaxies

"Half the universe’s ordinary matter was missing — and may have been found"

The long-sought matter appears to have been hiding in the gaps between galaxieshttps://www.sciencenews.org/article/universe-missing-matter-found-fast-radio-bursts

 

[PeterDonis]

Note that finding this "missing matter" does not mean there is no dark matter. It just means astronomers were having difficulty finding all the ordinary (non-dark) matter that should be there according to models of baryogenesis in the early universe.

 

[fresh_42]

Note that finding this "missing matter" does not mean there is no dark matter. It just means astronomers were having difficulty finding all the ordinary (non-dark) matter that should be there according to models of baryogenesis in the early universe.

Thanks for clarification, since the paper didn't make sense to me. If we explain all observations by the dark sector, what makes ordinary matter missing? How can something be missing, if we explain the missing otherwise. Made no sense, before you mentioned "models for baryogenesis".

 

[ohwilleke]

I would say "models for how many baryons there should be" more generally, and not truly models for baryogenesis per se, which is still quite murky.