Yeah, that's what I was just thinking

http://www.physorg.com/news/2011-08-dark-illusion-quantum-vacuum.html

Cool theory. I hope it gets more attention.

Basically says that the gravity between antimatter and matter has a positive sign and forms a gravitational dipole as they repel each other.

One very interesting thing it tries to do is explain what we are observing without assuming the existence of unknown forms of matter and energy, or of unknown mechanisms for inflation and matter-antimatter asymmetry. Not that Dark matter is impossible, there have been many Theories of the unknown that have eventually been realized. It's just interesting to see this process in motion in our time.

This is very interesting. I really hope this idea turns out to have some truth behind it. I think something along these lines makes a lot more sense than some mysterious unobservable type of matter making up a 1/3 of the universe.

does big bang/multiverse make a lot of sense ?

Big Bang? Yes, it makes perfect sense and agrees with observable data.

Multiverse? Depends on what you mean when you use that term. If you mean parallel universes, then it doesn't make sense but it is mathematically necessary in M-theory and in the "many worlds" interpretation of quantum mechanics. If instead you mean that there could have been several "places" at once that went "Bang", and each one created a universe that was forever separated from the others due to space-time between them expanding faster than the speed of light so that they can never physically intersect, then that makes sense, but it's impossible to know.

The big bang is a pretty strange idea too, all the evidence points to an expanding universe though and a smaller one in the past though. Everything coming from one single point is a little far fetched though.

Multiverse theories seem pretty plausible to me. With all the crazy things we've discovered in phyics in the past couple hundred years it seems likely there could be different universes separated by unseen dimensions.

interesting

Id have to say that so far the big bang theory is the only one that makes sense, and tests and testeble theories seems to cement the big bang theory as the only plausible theory to the creation of the universe. so far atleast.

as a side note scientists has discovered that the "primordial soup" would have behaved as a liquid, wich has led to new discoveries to the size of the univerese we are a part of. wich i find rather interesting, it seems that the visible universe is only a fraction of the size the universe that the big bang created due to background radiation not showing any waves.

I wont totally discount dark matter yet... but I have also thought the same about the gravitational pull through out space having play in it all..