The discussion centers on the implications of dark matter density in the early universe, referencing an article from Space.com. It confirms that early galaxies contained significantly less dark matter than previously thought, based on estimates derived from the Cosmic Microwave Background (CMB). This finding does not alter the total dark matter estimates but enhances our understanding of galaxy formation and the clustering behavior of dark matter during and after this process.
PREREQUISITESAstronomers, astrophysicists, and students of cosmology interested in the nature of dark matter and its influence on galaxy formation.
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