Interesting thought...could the acceleration of the expansion of the Universe be the product of exploding Stars and Supernova's?
I wonder if dark matter could be pushed along from the exploding stars helping the expansion acceleration? Perhaps acting in a way like electrons do in a wire?
I don't think so. First of all, as powerful as supernova are, they are insignificant when compared to the total size of the universe. The other problem is the the acceleration seems to be constant. If it was caused by supernova, then there should be a corresponding bump in speed at the time of the supernova explosion.
Also the expansion began before there were any stars. In fact it began before there was any difference between mass and energy.
No. Although it was never believed to be due to these things there's little difference between this and and another some other force causing the expansion. This other force was the big bang. This was the initial push, no different in theory to a universe that got the occasional push from a supernova. But an initial push or a series of occasional ones don't account for what we observe - constant acceleration. The problem isn't what caused the initial expansion. it's that gravity should have kicked in and slowed it down, or maybe even stopped then reversed it. But since we figured out that not only is the universe expanding, it's doing so at an increasing rate, we've had to hypothesize about a new force about which we know very little. This is dark energy. We don't know what it is and we can't see it yet, but whatever it is it's strong enough, in aggregate, to counteract gravity and cause things to accelerate rather than slow down. Gravity is a very weak force when compared to the kind of fundamental forces working at very small scales, so dark energy doesn't need to be very strong at all. But it has interesting implications. There are objects in the solar system that are moving away from us faster than the speed of light, for example. It turns out this doesn't violate the cosmic speed limit because they are not moving through space at some impossible rate, but instead space itself is expanding faster than light and carrying whatever sits in it along for the ride. Any objects currently retreating faster than light are by definition undetectable to use - any signal they emit can only travel towards us at about light speed but the distance between us is growing faster than that. The signal can never cover the distance. This means that, eventually, everything but our immediate galaxy will have accelerated away past our ability to see it. Without any historical record of the way things are now there would be no evidence that aside from the nearby stars the universe is completely empty. Although this isn't imminent - our sun will have run out of hydrogen to fuse long before it looks like we're alone out here.
You're assuming too much about the nature of dark matter. Is it something that can be "pushed" at all? Is it something that exists or merely a fundamental (or emergine) property of space? Or of objects moving through space? Currently the term is just a placeholder used to describe the effects of something we know is happening. But while we've learned a lot about what this something does we know very little about how it accomplishes it.
