Comment Re:I know its not an original idea (Score 3, Interesting) 29
Second order effects. The following is wrong and grossly oversimplified but gives some idea of how it works.
The 2.7K Cosmic Microwave Background (CMB) is understood to be red-shifted thermal emissions from a 3000K H/He plasma from when the universe was very young. The red shift is caused by the expansion of the universe. Dark matter can cause small variations in either the temperature or polarization of those thermal emissions by gravitationally making the plasma denser (and hotter) or less dense (and cooler). Detailed measurements of the CMB is what has really motivated most of the dark matter / dark energy picture.