On Sunday, October 11, 2020 at 11:38:55 PM UTC-6, Alan Grayson wrote: > > > > On Sunday, October 11, 2020 at 8:37:29 PM UTC-6, Lawrence Crowell wrote: >> >> After LC > > > *Do all BB theories contain the reheating postulate? AG* >
*It's not a hard question, and then we're probably done here. I want to know if all BB theories have the reheating postulate? I want to know if it's a necessary postulate that solves some outstanding problems, or can it be dispensed with. AG * > >> >> On Sunday, October 11, 2020 at 8:57:20 PM UTC-5 agrays...@gmail.com >> wrote: >> >>> >>> >>> 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 agrays...@gmail.com >>>> 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 agrays...@gmail.com >>>>>> 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 >>>>>>>> agrays...@gmail.com 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 >>>>>>>>>> agrays...@gmail.com 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 everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/855606b6-f791-4e58-8019-ebfc75cf601bo%40googlegroups.com.
