Matter and antimatter must interchangible

[shrumeo]

I don't think that is the general consensus. The general consensus - right now - is that there were equal amounts of antimatter and matter, but that symmetry is broken between the two - ie. antimatter is not exactly the same as matter, and for some reason, in our universe, decays a little more quickly. This is what leads to the imbalance. This, if I remember correctly, is borne out in a number of experiments which have illustrated broken symmetry, though results are not yet conclusive, since the effects observed do not fully account for the size of the imbalance.

Also, antimatter/matter imbalance is different from charge conservation. 1 proton + 1 antiproton -> 1 proton + 1 electron conserves charge, but still breaks the standard model.

I see. Thanks for clearing that up. :shy:
It's not that there was more antimatter, it just decays (into?) quicker.
And there might have been simply a symmetry imbalance, not a charge imbalance.

 

[scarecrow]

I don't know enough about astro-physics, but after reading some stuff on this subject of anti-matter, it just came to me that if assuming Einstein's theory of space-time and his analogy of gravity to a trampoline (I would say blanket) and curved space...can't the universe be sitting on anti-matter and that is exactly what we feel as gravity.

Someone please set me straight. Thanks.