On Sunday, October 11, 2020 at 8:07:33 AM UTC-6, Lawrence Crowell wrote: > > On Sunday, October 11, 2020 at 5:42:53 AM UTC-5 [email protected] wrote: > >> >> >> On Sunday, October 11, 2020 at 4:25:04 AM UTC-6, Lawrence Crowell wrote: >>> >>> >>> >>> On Saturday, October 10, 2020 at 8:52:58 PM UTC-5 [email protected] >>> wrote: >>> >>>> >>>> >>>> On Saturday, October 10, 2020 at 5:25:35 PM UTC-6, Lawrence Crowell >>>> wrote: >>>>> >>>>> >>>>> >>>>> On Saturday, October 10, 2020 at 5:32:25 PM UTC-5 [email protected] >>>>> wrote: >>>>> >>>>>> >>>>>> >>>>>> On Saturday, October 10, 2020 at 1:03:00 PM UTC-6, Lawrence Crowell >>>>>> wrote: >>>>>>> >>>>>>> On Friday, October 9, 2020 at 12:27:00 PM UTC-5 [email protected] >>>>>>> wrote: >>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Friday, October 9, 2020 at 3:53:46 AM UTC-6, Lawrence Crowell >>>>>>>> wrote: >>>>>>>>> >>>>>>>>> I read this yesterday. It so far appears there is no data to >>>>>>>>> support information from a prior cosmic cycle. >>>>>>>>> >>>>>>>>> Penrose did ground breaking work on the nature of black holes and >>>>>>>>> I think his crowning achievement in mathematical physics is twistor >>>>>>>>> theory >>>>>>>>> of the mid 70s. His CCC theory is a bit like Hoyle's steady state >>>>>>>>> theory in >>>>>>>>> that it is a sort of intended obstruction to a more successful theory >>>>>>>>> that >>>>>>>>> is gaining support. >>>>>>>>> >>>>>>>>> LC >>>>>>>>> >>>>>>>> >>>>>>>> *Please clarify your last sentence above. What "more successful >>>>>>>> theory" are you referring to; the hot BB with inflation? AG * >>>>>>>> >>>>>>> >>>>>>> Primarily back then it was just BB. Now with inflation a much wider >>>>>>> range of problems have been solved, and it is supported by CMB data. >>>>>>> >>>>>>> LC >>>>>>> >>>>>> >>>>>> *Has anyone proposed a Cold BB, which seems illogical since one can >>>>>> imagine an expanding universe backward in time; that is, contracting and >>>>>> getting denser and hotter? AG * >>>>>> >>>>> >>>>> As a rule the more a gas is compressed the hotter it gets. >>>>> >>>>> LC >>>>> >>>> >>>> Of course. Does that mean a COLD BB has never been proposed because it >>>> defies our understanding of how a contracting gas behaves? AG >>>> >>> >>> Yes. >>> >>> LC >>> >> >> *TY. Then it cools as it expands. But why do some, or is it all BB >> theories, propose a "reheating" phase? How could it reheat if it is still >> expanding? What's the need for reheating? AG * >> > > That involves the vacuum physics of inflation. It is analogous to a phase > transition and the reheating might be compared to latent heat of fusion. > > LC >
*Does reheating occur before or after inflation? Is this the case for every (hot) BB theory? 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/fd5f1d1b-7dc7-4167-afb7-bca97254c616o%40googlegroups.com.
