Inhomogeneities are there because of fluctuations in the metric during the inflation?WHY there was any inhomogeneities in the early universe is beyond my knowledge. We see the remnants of it in the CMB, which shows inhomogeneities of 1 part in 100,000
http://casa.colorado.edu/~bally/ASTR2010_F12/SciAm_Myth_of_Time_Veneziano.pdf [Broken]Does it make any difference if the seed galaxies were formed from inhomogeneites in a bouncing universe, where deconstruction was not complete?
Can you elaborate on why dark matter is required for early galaxy formation? Or link something that elaborates?Keep in mind there was also a prodigious amount of dark matter in the primordial universe that influenced galaxy formation. Without dark matter, it is nearly impossible to even model early galaxy formation. You might get the odd star here and there, but, not dense populations. It is even considered possible DM fostered the formation of primordial SMBH, which seeded galaxy formation.
At the time when the CMB originated, how were CDM and baryonic matter distributed?http://arxiv.org/abs/0909.2021, Dark Matter and Galaxy Formation
May well have happened that way, but don't forget, dark matter was interspersed with regular matter as far as is known so the BHs would all be 80% dark matter (not that it matters since once inside the EH, it's irrelevant what kind of matter it was outside) ; I'm just pointing out that the BHs would NOT have formed primarily from hydrogen as you posit but from the same inhomogeneities (in ALL matter) that I mentioned in post #2Obviously there is no way to know for sure yet, but I believe that the hydrogen gas clouds in the early universe compressed then formed super massive black holes. Then the remaining gas that was orbiting the bh later compressed into stars due to the effects of the bh.
DM passes through other matter today because it doesn't interact with it. But passing through a BH would require the DM to travel faster than light (in order to escape the hole's horizon once it was inside). That's not possible.It's possible that the DM might have kept passing through the nascent BH (the way it passes through the center of galaxie today)
Yes, but I didn't SAY it would pass through a BH, 'cause I know better. I said it might pass through the NASCENT black hole (and thus not make up as much of the BH as I first stated it would).DM passes through other matter today because it doesn't interact with it. But passing through a BH would require the DM to travel faster than light (in order to escape the hole's horizon once it was inside). That's not possible.
Science is not about beliefs. Are there publications supporting this idea?Obviously there is no way to know for sure yet, but I believe that the hydrogen gas clouds in the early universe compressed then formed super massive black holes. Then the remaining gas that was orbiting the bh later compressed into stars due to the effects of the bh.
Ah, ok, so by "NASCENT black hole" you meant "a region where a black hole is going to form but hasn't formed yet", so the DM can still pass through and escape. Sorry for the misunderstanding on my part.I said it might pass through the NASCENT black hole (and thus not make up as much of the BH as I first stated it would)
I don't see where this conclusion comes from. We know upper limits on the amount of dark matter falling into the black holes - so what? Dark matter particles can fall into black holes like regular particles. They just don't form an accretion disk.DM appears resistant to capture by black holes
In common terminology, resistant doesn't imply 100% of the time. A water-resistant watch is not water-proof. Wrinkle-resistent clothes, drug resistant virus, etc... The term doesn't mean "always" or "never". In this case, "immune to capture" would imply that DM never falls in.I would not call something "resistant to capture" if it does fall in, just at a significantly lower rate.
Using "like" to compare how DM reacts to how 'regular particles' react is a bit of a gloss over. DM would need to be aimed right "on target" (or very close) to the BH or it will slip through any accretion disk and pass right by the BH.Dark matter particles can fall into black holes like regular particles. They just don't form an accretion disk.
Its angular momentum has to be smaller than ##x c R_s## where x is a prefactor of the order of 1 (I think 2 for a non-rotating black hole, it gets a function of the orientation for rotating black holes).Using "like" to compare how DM reacts to how 'regular particles' react is a bit of a gloss over. DM would need to be aimed right "on target" (or very close) to the BH or it will slip through any accretion disk and pass right by the BH.
Please clarify what you mean by "massive" here. I thought that DM particles had to have some rest mass, even if very small. If you're suggesting DM could be massless neutrinos, I thought that couldn't work because they couldn't be gravitationally captured.One of the newer DM candidates is sterile neutrinos. I find that attractive because it avoids the problems inherent to massive DM particles.