No evidence for a Universe before the Big Bang
Nobel Laureate Roger Penrose, famed for his work on black holes, claims we’ve seen evidence from a prior Universe. Only, we haven’t.
Penrose’s idea of a conformal cyclic cosmology hypothesizes that our Universe arose from a pre-existing Universe that would leave imprints on our cosmos today. This is a fascinating and imaginative alternative to inflation, but the data doesn’t support it, despite Penrose’s dubious claims that it does. The original Big Bang has since been modified to include an early inflationary phase, pushing whatever came before inflation to an unobservable place. When inflation ends, the hot Big Bang ensues, and we can see evidence from the final tiny fraction-of-a-second of inflation imprinted on our observable Universe. However, we can’t see anything from before that time. Despite the assertions of one of the most famous living physicists, there’s no evidence for a Universe prior to that. (cont. https://xenagoguevicene.wordpress.com/2023/02/26/there-is-no-evidence-for-a-universe-before-the-big-bang-by-ethan-siegel-big-think-feb-2023/ )
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