Our most precise estimates of the total dark matter density stem from the CMB, which was before any galaxies. Dark matter fraction estimates from galaxies tend to be far, far less accurate, because it's nearly impossible to measure the amount of dark matter that's between galaxies.Tanelorn said:This suggests to me that the early universe did not contain as much dark matter.
Is this correct? If so it might give a clue what D.M actually is?
http://www.space.com/36083-dark-matter-minor-ingredient-of-early-galaxies.html
Dark matter is a type of matter that makes up about 85% of the universe, but it does not interact with light and cannot be directly observed. It is believed to exist due to its gravitational effects on visible matter and the structure of the universe.
Scientists believe that dark matter plays a crucial role in the formation and evolution of galaxies, and it is essential in understanding the structure of the universe. It also helps explain discrepancies in the observed mass and gravity of galaxies.
Scientists use various methods to study dark matter, including observing its gravitational effects on visible matter, studying the rotation curves of galaxies, and analyzing data from particle accelerators that may produce dark matter particles.
The article is about a recent study that suggests dark matter may not be made up of hypothetical particles called WIMPs (Weakly Interacting Massive Particles), but instead, it may be made up of primordial black holes.
If confirmed, this study would challenge the widely accepted theory of dark matter being made up of WIMPs and open up new possibilities for understanding the nature of dark matter and the universe. It could also have implications for future research and experiments in the field of dark matter.