Now two points here. (1) Most Cyclic Universe theories I've heard require the universe to reverse course and fall back into a Big Crunch to recycle again. Now that Dark Energy has been discovered, the chances of a Big Crunch have gone away. (2) Some theories suggest that the universe started with a massive quantum fluctuation, the kind of which we have never seen since. So my question would be why have we not seen another Big Bang level quantum fluctuation again? My assumption is that the presence of having the current universe here right now is itself the reason why such massive fluctuations have not reoccurred. Perhaps the structured universe itself suppresses the biggest fluctuations? So, what I'm thinking is that once Dark Energy clears out the present universe, leaves behind mainly empty voids, then that will clear the way for more massive fluctuations to occur. This may start a brand new universe in all of the emptiness. So the Cyclic universe models would still work, it just won't be with a Big Crunch associated with it too. What do you think?