I've been reading Julian Barbour's excellent book 'The End of Time' which is based on his work on foundational issues in Physics (specifically time and space). I like his ideas a lot, however I'm sure I read in it a description of the big bang which was in reference to Mach, I think, that showed the reversibility of direction of time. So you could imagine a universe in which the big bang is not the 'beginning' but the middle as it were. To put it in very flaky terms, imagine that on the 'other side' of the big bang event is a mirror universe with time running in the other direction. I've imagined it like two cones touching at their apexes. I might have hacked it together from more than one place though. I like the idea because that it gets rid of the question 'what was before the big bang' because you can imagine an infinite universe temporally (ie heat death at either end, well you know what I mean) but with a creation event in the middle. Is this a possible scenario? If so where can I read more about it?