re: Dark matter and dark energy.

Not sure I am understanding you. Dark matter is certainly not antimatter. Dark matter is very likely a subatomic particle that dominated the scene after the big bang. It may even have been responsible for making the ordinary matter that we can see by releasing electrons in violent collisions with each other when they were densely packed together when the universe was less than a second old. It's just really hard to measure and observe something that doesn't interact with light.