Timeline for Are black holes considered part of baryonic content of universe?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Sep 29, 2020 at 7:20 | comment | added | Leos Ondra | Thank you for the detailed answer. In the meantime I had a look at some review papers about cosmology (for example this one: pnas.org/content/112/40/12243). | |
| Sep 28, 2020 at 19:55 | vote | accept | Leos Ondra | ||
| Sep 27, 2020 at 15:39 | history | edited | ProfRob | CC BY-SA 4.0 |
added 277 characters in body
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| Sep 27, 2020 at 15:30 | comment | added | ProfRob | @mmeent Because dark matter is non-dissipative and doesn't form accretion discs around black holes. There needs to be an almost direct hit for a dark matter particle to be trapped by a black hole. | |
| Sep 27, 2020 at 15:27 | comment | added | ProfRob | @rob Your definition isn't useful. Black holes that are not primordial are counted as baryonic mass because they are made of baryons. Non-primordial black holes don't evaporate on any interesting timescale. | |
| Sep 27, 2020 at 15:14 | comment | added | rob | I had imagined black hole formation as a way that matter is transferred from the baryonic sector to the non-baryonic sector, just like black hole evaporation is a transfer to the radiation sector. (A sentence which wants more caveats than I can fit in a comment.) I see why your distinction is useful for cosmology, but it surprised me. | |
| Sep 27, 2020 at 11:00 | comment | added | TimRias | Is there a simple explanation why the cross section for accreting dark matter should be much smaller than for ordinary matter? | |
| Sep 27, 2020 at 6:55 | comment | added | ProfRob | @rob I guess I'not following what "catch" or problem you think there is. Black holes formed since the big bang are almost entirely made of baryons. Therefore they count as baryonic mass in cosmology. Black holes that were present prior to nucleoynthesis were unavailable to form nuclei and are counted as non-baryonic dark matter. | |
| Sep 27, 2020 at 0:03 | comment | added | rob | This is an interesting perspective, since (as I understand it) the “no-hair theorem” says that baryon number is not necessarily conserved during black hole evolution. | |
| Sep 26, 2020 at 22:54 | history | answered | ProfRob | CC BY-SA 4.0 |