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 [email protected] >> 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 [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/855606b6-f791-4e58-8019-ebfc75cf601bo%40googlegroups.com.
