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Dark Matter(I have included links, but the site does not allow it - they are mostly Wikipedia. I would love your feedback.)In QM, gravity is considered a force, the graviton being the force carrier. In GR, gravity is represented as a geometric curvature of spacetime created by mass.When we have (spacetime) expansion and we have (spacetime) curvature, it is hard not to imagine waves. With the exception of matter, everything else in the universe seems comprised of waves. Gravity waves were predicted by Einstein and recently observed emanating from neutron stars.
It would seem very strange to have a high density measurement of something in a system without also having a low density reading somewhere else in the system. This would seem to be the nature of a continuum. It is then from inference we can suggest that if high density is gravitationally attractive, low density must be gravitationally repulsive. In fact all the things that we would predict of low density space is what Dark Energy seems to be