On Tuesday, October 29, 2019 at 2:31:14 AM UTC-6, Philip Thrift wrote: > > > > On Monday, October 28, 2019 at 7:21:40 PM UTC-5, Lawrence Crowell wrote: >> >> On Monday, October 28, 2019 at 8:24:39 AM UTC-6, John Clark wrote: >>> >>> On Sun, Oct 27, 2019 at 8:56 PM Alan Grayson <[email protected]> >>> wrote: >>> >>> On Sunday, October 27, 2019 at 10:04:42 AM UTC-6, Lawrence Crowell wrote: >>>> >>>> *Quantum mechanics makes no particular prediction on the continuity of >>>>> spacetime. If one equates the Schwarzschild radius with a Compton >>>>> wavelength you get the Planck scale of 1.6x10^{-35}m. However, this >>>>> really >>>>> just tells us one is not able to locate a qubit in a region smaller than >>>>> this scale. The Fermi and Integral spacecraft data on arrival times of >>>>> different wavelengths of radiation from burstars indicates spacetime is >>>>> smooth to two orders of magnitude smaller than the Planck length.* >>>>> >>>> >>>> *> You're out of my depth here. If the Schwartzshild radius has one >>>> value, and the Compton wavelength has another value, why would anyone want >>>> to equate them? AG* >>>> >>> >>> The Compton wavelength of a particle is just the wavelength light would >>> have if the mass of the particle were converted to energy. As the >>> wavelength gets smaller the energy gets larger, at some point the energy >>> gets so high and the distance so small it turns into a Black Hole; that >>> distance is the Planck length the time it takes light to move that distance >>> is the Planck Time and the amount of mass required is the Planck Mass which >>> is about the mass of a flea egg. The most acceleration anything can >>> have is the Planck Acceleration, it is the amount of acceleration needed to >>> move something from a speed of zero to the speed of light in the Planck >>> Time, and the hottest that things can get is the Planck Temperature >>> (1.4*10^32 Kelvin) because anything hotter would start radiating Black >>> Holes instead of Blackbody Radiation. Or at least that's what Quantum >>> Mechanics says, but if the evidence from the Fermi and Integral spacecraft >>> holds up and spacetime really is smooth then something is wrong with this >>> picture. >>> >>> John K Clark >>> >> >> That is basically it. The Planck scale does not say that spacetime is >> sliced and diced up into chunks. It just says that if you try to localize a >> qubit onto a region smaller than √(Għ/c^3) ~ 1.6×10^{-35}m one gets a >> quantum of black hole that conceals the qubit for a tiny time interval >> √(Għ/c^5) ~ 5×10^{-44}sec before it explodes into a huge number of low mass >> particles. It is a sort of Heisenberg microscope argument. >> >> The LQG machers were forced into a frantic fix on their loop theories >> that had spacetime chopped up near the Planck scale. The data very much >> appears to indicate that spacetime is not built up from chunks, but instead >> it may be built from nonlocal quantum entanglements. So rather than >> spacetime being a highly localized structure, with it might be added a lot >> of fine tuning of variables, it is more an emergent phenomenon due to >> nonlocaly of QM and entanglements. >> >> LC >> > > > Of course space being made of "variables" vs. foam is a more > mathematically Platonistic view. > > *Emergent 4-dimensional linearized gravity from spin foam models* > https://arxiv.org/pdf/1812.02110.pdf > <https://www.google.com/url?q=https%3A%2F%2Farxiv.org%2Fpdf%2F1812.02110.pdf&sa=D&sntz=1&usg=AFQjCNEvHw9-QxNM9tkpfXe2G2qqf4IB7Q> > > > In this paper, we show for the first time that smooth solutions of > 4-dimensional Einstein equation emerge from Spin Foam Models (SFMs) under > an appropriate semiclassical continuum limit (SCL). > > > > @philipthrift >
I downloaded this and I am aware of these ideas. I still prefer holographic quantum entanglement. It really is much simpler because the fundamental physics is on a lower dimensional manifold. I will try to read this before too long however. LC -- 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/ce9ab848-9928-42ca-bbc3-237c594763e9%40googlegroups.com.
