Before the Big Bang
"With only massless ingredients left, the universe loses track of time because it's just photons around and they don't care about it. So we can look at this picture in the future as well, and in the remote future, again, the universe loses track of time.
"I'm going to try and show you what this crazy scheme is. Here we have a cartoon of our universe expanding out indefinitely, and by two tricks we can represent this initial state, a nice smooth boundary, and the final state by another. These are just mathematical tricks for the moment, but as far as the matter in the universe is concerned, it doesn't even know the boundary is there because it has lost track of time.
"So here's the crazy idea. I'm considering that that universe phase is just one phase out of a succession of phases. I'm going to refer to these things as eons. This is our eon, if you like. That's our Big Bang, that's our remote future. This remote future will be the Big Bang of the next eon. This Big Bang was the other side of this boundary of the remote future of the previous eon." - Roger Penrose
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