On Sunday, September 15, 2019 at 10:08:00 AM UTC-6, Jason wrote: > > > > On Sun, Sep 15, 2019 at 7:45 AM Alan Grayson <agrays...@gmail.com > <javascript:>> wrote: > >> >> and COOLER after 380,000 years had elapsed. All of the foregoing makes a >>>>>>> decent case for a universe which was very very tiny right after the BB. >>>>>>> AG >>>>>>> >>>>>> >>>>>> I still see no connection between the temperature at time 380,000 >>>>>> years, and the size of the universe. Can you do more to explain more >>>>>> why >>>>>> you think there is a relation? I can see how you might relate the >>>>>> initial >>>>>> temperature and density at an earlier time to the temperature and >>>>>> density >>>>>> after 380,000 years, but I am not seeing how you relate the size of the >>>>>> universe to either the temperature or density at time 380,000 years. >>>>>> >>>>> >> *Oh, because the temperature is decreasing from just after the BB to >> 380,000 years, we need a very small universe to inflate to explain the >> current homogeneity. Otherwise the present large scale homogeneity is only >> explicable by appealing to highly improbable chance in a causally >> disconnected universe, our present universe. AG * >> > > Inflation requires a *minimum* starting size (which can be microscopic), > and *minimum* duration of inflation (which can be as little as ~100 > doublings) taking as little as 10^-35 seconds, but as far as I know these > are only the minimums to be congruent with observations. Inflation, by no > means requires the preinflation universe to be tiny, nor the time period of > inflation to be short. Either the preinflation size could be unboundedly > large, or the inflation duration could be unboundedly long. > > Jason > > If inflation is to solve large scale homogeneity in a causally non-connected universe, which is the case of our present observable universe, it must start with a very small universe that IS causally connected. I think this is pretty obvious, unless you want to insist that the large scale homogeneity is purely accidental -- which I do not. AG
Incidentally, I didn't claim that inflation per se is totally speculative. It solves a number of problems so it is more than pure speculation. I was then referring to speculation that some parts of the total universe, either within our observable or unobservable regions, or in the presumed substratum from which bubbles arise, or in other bubbles, are experiencing any types of inflations. The only inflation that I am discussing is within our bubble, and perhaps extended to our unobservable regions by applying the Cosmological Principle. 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/6a194f84-0b93-4f61-9f8e-e55966674c27%40googlegroups.com.
