Sir Roger Penrose on events before the big bang:
Stephen Sackur talks to Sir Roger Penrose about his latest theory on what may have existed before the Big Bang
Penrose says that because thermodynamics says the universe becomes more disorganised with time, as you look backwards in time the amount of order increases towards infinity. The BBC news reported suggests God is the reason for the initial high degree of order of the big bang, but Penrose defends science.
Penrose's new idea is very simple, one of the 10 components of the spacetime metric is special, and when the universe has eventually decayed entirely into radiation (assuming that even protons decay, albeit with an undetectably long radioactive half-life, as per Standard Model predictions), it loses any meaningful measure of 'time' (I've pointed out in Electronics World and on my site for years that time is entirely linked to organised motion, and when you lose any organised motion, time is meaningless). Therefore, because of the link between space and time (spacetime), space disappears and the state is effectively a singularity.
Hence at the very moment that the last proton or muon decays, the whole universe is then a fresh singularity, and the big bang occurs all over again. (This is entirely different from the old 'oscillating' universe prediction from general relativity.) I'd like to see a complete proof please! Personally, I think Penrose is right, as the idea is factually defendable and yet radically crazy enough to explain everything, and he says it makes testable predictions which astronomy can check.