Quote:
Originally Posted by renormalised
Yes, but the numbers are fluid. They'll change as they finesse the quantities of the matter/energy that they find. However, even if they found 10 times more baryonic matter than they know of now, it's still not going to change the percentages much. It would still be an order of magnitude too small to account for what they observe is going on. It wouldn't matter how many dwarf galaxies and such they found, there's just not enough of them to make a significant dent in the percentages. If there were that many, they would've detected them by now. And, if there were that much baryonic matter around, it would completely change the geometry of spacetime and affect everything within it.
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The proportions of baryonic:dark matter are provided by the acoustic oscillations in the CMBR aren't they ?
So, even if more baryonic matter is discovered, the proportions would still be what is shown in the CMBR power density spectrum (?)
Interestingly, if there are more dwarf and spiral galaxies discovered, then there would also be more dark matter required for them to 'do their things'.
So, adding more baryonic matter invariably results in the same ratio of DM to baryonic but just more matter (?). The volume of the universe is so big, the density wouldn't change much either .. so once again, additional baryonic wouldn't impact much.
There are lots of different data sets which lead to the need for dark matter, also. Each of these impose their own constraints on the proportions don't they ? (Just like the CMBR).
Cheers