No Big Bang? Quantum equation predicts universe has no beginning

[Alex K]

How do we explain Cosmic Background Radiation and the Universe's expansion?

Don't get them wrong, the usual "hot big bang" picture remains exactly the same in their model, we are really only talking about the first tiniest fraction of a second where general relativity breaks down and quantum gravity effects play a role. We knew already that the classical gravity cannot be extrapolated back to a singularity (If you've listened to me here in the past, I go on and on about that at every opportunity), but the question what happens *instead* is hard to answer reliably.