Penrose's CCC

Hello gentlemen! I recently discovered Sir Roger Penrose's conjecture about Conformal Cyclic Cosmology, and I find it very interesting. His claim that there are visible traces of the past aeon (former universe) in the CMB is a very intriguing, but I just can't wrap my head around how a cold, massless, radiation filled universe can turn into a hot dense singularity. Maybe someone here can explain it in layman's terms? What do you think about the CCC theory? Here's a 39 minute video

By QuantumT, October 10, 2020
1 reply

Due to the effects of gravity. Remember that in General Relativity, all forms of energy-momentum are sources of gravity, not just mass; so whether the universe contracts, expands, or stagnates just depends on the average energy-density, even if there is no conventional form of mass). Note also that in this scenario there would be no singularity; contraction just turns into expansion below a certain minimum scale.

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