On Tuesday, August 20, 2019 at 4:56:23 PM UTC-5, Alan Grayson wrote: > > https://en.wikipedia.org/wiki/Conformal_cyclic_cosmology > > Is this a viable theory for avoiding a BB interpreted as a singularity? AG >
Penrose proposed a conformal identification of spatial infinity in the past and future i^±∞ of FLRW spacetimes. A cosmology expands and in the limit time → ∞ it transitions into a new cosmology. The de Sitter vacuum is not eternally stable, so the idea may have some germ of relevancy. I am not sure about how this would work with vacuum to vacuum transitions. The exponential expansion of the universe is a sort of time dependent conformal transformation with a small vacuum expectation for the scale field. To transition to a new cosmology, say with inflationary expansion, this means the vacuum expectation is increased. The overall physics community response to this has been tepid at best. There are some possible conflicts with observed data. LC -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/defc6a91-7696-4ba8-b19c-1169116aa339%40googlegroups.com.
