From previous universe:
In Penrose and similarly-inclined physicists’ history of space and time (which they call conformal cyclic cosmology, or CCC), universes bubble up, expand and die in sequence, with black holes from each leaving traces in the universes that follow. And in a new paper released Aug. 6 in the preprint journal arXiv—apparent evidence for Hawking points in the CMB sky— Penrose, along with State University of New York Maritime College mathematician Daniel An and University of Warsaw theoretical physicist Krzysztof Meissner, argued that those traces are visible in existing data from the CMB.
Daniel An explained how these traces form and survive from one eon to the next.
“If the universe goes on and on and the black holes gobble up everything, at a certain point, we’re only going to have black holes,” he told Live Science. According to Hawking’s most famous theory, black holes slowly lose some of their mass and energy over time through radiation of massless particles called gravitons and photons. If this Hawking radiation exists, “then what’s going to happen is that these black holes will gradually, gradually shrink.”Rafi Letzter, “Physicists Think They’ve Spotted the Ghosts of Black Holes from Another Universe” at Resonance Science Foundation
We are told that they will entirely disintegrate, resulting in a universe that is a soup of “massless gravitons and photons don’t really experience time or space.” At that point, because those are pre-Big Bang conditions, the whole thing will start up again.
Apart from the difficulty of demonstrating the proposition, would it make any difference if it were true? If not, what makes the proposition science?
File under: Why Sabine Hossenfelder, author of Lost in Math: How Beauty Leads Physics Astray, is tied of particle physics.
See also: How Roger Penrose proposes that the universe can be eternal Hossenfelder: According to Penrose’s conformal cyclic cosmology, the universe goes through an infinite series of “aeons,” each of which starts with a phase resembling a big bang, then forming galactic structures as usual, then cooling down as stars die.