I've just thought of something that may be completely wrong and is just waiting to be kicked down, trodden underfoot etc. Now a problem with BB is that the theory of it as a case of quantum fluctuations seems to require the production of a particle and anti-particle together, and our measurements of the universe find very little antimatter. It is general presumed to be due to assymetry in decay rates that we get this unequal distribution. So far, so good? Now my alternative to this is to consider the original event as being not only at the "centre of the universe" in space, but also to have instead occured as an event in the "centre of time"(or if not the exact centre, then at some point not at a beginning of time.) Then, we can speak of the "missing anti matter" as matter that was sent backwards in time from the big bang event, and so cannot be observed. Now, point out the obvious mistake. There probably is one.