> On 5 Jun 2020, at 19:11, smitra <smi...@zonnet.nl> wrote: > > On 05-06-2020 18:07, Jason Resch wrote: >> On Fri, Jun 5, 2020, 5:55 AM Bruce Kellett <bhkellet...@gmail.com> >> wrote: >>> On Fri, Jun 5, 2020 at 7:16 PM Jason Resch <jasonre...@gmail.com> >>> wrote: >>> On Mon, Jun 1, 2020 at 8:51 PM Bruce Kellett <bhkellet...@gmail.com> >>> wrote: >>> On Tue, Jun 2, 2020 at 9:59 AM Jason Resch <jasonre...@gmail.com> >>> wrote: >>> On Monday, June 1, 2020, Bruce Kellett <bhkellet...@gmail.com> >>> wrote: >>> On Tue, Jun 2, 2020 at 5:39 AM Jason Resch <jasonre...@gmail.com> >>> wrote: >>> On Mon, Jun 1, 2020 at 6:26 AM Alan Grayson <agrayson2...@gmail.com> >>> wrote: >>> On Monday, May 18, 2020 at 9:20:36 PM UTC-6, Jason wrote: >>> I recently wrote an article on the size of the universe and the >>> scope of reality: >>> https://alwaysasking.com/how-big-is-the-universe/ >>> It's first of what I hope will be a series of articles which are >>> largely inspired by some of the conversations I've enjoyed here. It >>> covers many topics including the historic discoveries, the big bang, >>> inflation, string theory, and mathematical realism. >>> Jason >>> I see you agree with the MUH that there are infinite, identical >>> repeats of any universe. >> To be clear, the MUH is separate theory from the idea of a spatially >> infinite universe (which is just the standard cosmological model that >> working cosmologists assume today, that the universe is infinite, >> homogeneous, and seeded by random quantum fluctuations occurring at >> all scales during the expansion of the universe). >> Define what you mean by "quantum fluctuations". There are no such >> things in standard quantum mechanics. >> Variations in the decay of the inflaton field that seeded the >> variations in density that led to stars and galaxies, and confirmed by >> observations by COBE and Planck. >> That is not how inflation models work. >> Are you sure about that? If so could you explain the error in this or >> in my understanding of it: >> https://www.youtube.com/watch?v=chsLw2siRW0&t=6m43s >> You video gives an oversimplified comic-book version of inflation. If >> you want to understand inflation, you have to go to a professional, >> expert review, such as Bassett, Tsujikawa, and Wands, Rev. Mod. Phys. >> 78:537-589 (2006). (Also in arXiv:0507632). You will see from this >> that density perturbations are just Guassian random fields, put in by >> hand, with parameters adjusted to fit the data. There are no intrinsic >> "quantum fluctuations". >> According to the theory what is the source of this gaussian >> randomnesses? What makes a field random if not quantum mechanics? >> Jason > > There obviously do exist quantum fluctuations. A down to Earth example is > Johnson noise. Connect a sensitive voltmeter to a resistor and you'll detect > fluctuations in the voltage. The average voltage is zero, but there are > fluctuations due to thermal motion of the electrons. If you cool down the > resistor these fluctuations will become smaller, but even at absolute zero > there will still be fluctuations in the voltage. These fluctuations at zero > temperature are what we call "quantum fluctuations" in physics. Now I > remember an old discussion with Bruce on this list about this, and insisted > that what I called quantum fluctuations are actually "thermal fluctuations at > 0 K". But at 0 K the system is in the ground state, so it doesn't matter what > you name you give to the fluctuations, these are purely quantum mechanical in > nature, they don't arise from an initial randomness in the initial state.
Eventually, they do arise from the fact that no universal machine can know in which history she belongs, and that even the physical void is a phenomenological product of infinitely many computations. Actually, when we assume Mechanism. Bruno > > Saibal > > -- > 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/8dbb74432f8182d5f73eabde7188f91b%40zonnet.nl. -- 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/63346FF0-D31A-42C1-9ECF-366C5F7339B2%40ulb.ac.be.
