On Wednesday, August 21, 2019 at 11:37:40 PM UTC-6, Alan Grayson wrote: > > > > On Wednesday, August 21, 2019 at 7:12:14 PM UTC-6, Alan Grayson wrote: >> >> >> >> On Wednesday, August 21, 2019 at 3:13:11 PM UTC-6, Lawrence Crowell wrote: >>> >>> 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 >>> >> >> FWIW, ISTM that what GR might be indicating about the BB, is that, >> insofar as it's a singularity, it couldn't have occurred, and didn't >> occur. This is to say the universe didn't become infinitely small in >> spatial extent, like a mathematical point, but rather that there was a >> maximal finite value of its energy density, hugely high but not infinite. >> For this reason I find the cyclic models promising, although, as you >> rightly indicate, they're far from complete or bug-free. AG >> > > Which brings up a possibly relevant question: If the total energy of the > universe occupied zero spatial volume (the presumed condition of the > universe at t=o according to the BB theory), wouldn't that contradict the > Uncertainty Principle? AG >
If the BB is imagined as a point in time, t=0, when the total energy of the universe was "confined" to zero spatial volume, it never existed insofar as it's self contradictory. AG -- 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/67f44662-8ca0-423d-8985-d6c81a2b0709%40googlegroups.com.
