The argument is a bit difficult, but the dS vacuum has positive energy and there is some probability of it tunneling to a lower value. It may do this "drip by drip" with Gibbon-Hawking radiation. It could also transition into an anti-de Sitter vacuum. In that case the vacuum energy is negative, but there are conditions for regular eigenvalued orbits that define a minimum. That is a difficult subject involving the moduli of hyperbolic geometries. So string theory is not needed to understand this. In fact the de Sitter vacuum is "anti-string," and string theory has nothing directly to do with the spectra of elementary particles or the vacuum in the observable universe, That is except with colliding black holes.
LC On Monday, June 28, 2021 at 5:31:47 PM UTC-5 Bruce wrote: > On Tue, Jun 29, 2021 at 12:12 AM Lawrence Crowell < > [email protected]> wrote: > >> On Saturday, June 26, 2021 at 4:36:47 PM UTC-5 Brent wrote: >> >>> On 6/26/2021 9:15 AM, John Clark wrote: >>> >>> On Sat, Jun 26, 2021 at 7:43 AM Tomas Pales <[email protected]> wrote: >>> >>> *> While the anthropic principle might be used to explain why the laws >>>> have been stable in the past (because this stability is probably necessary >>>> for the evolution of living or conscious organisms such as humans), it >>>> doesn't seem to explain why we should expect that the laws will continue >>>> to >>>> be stable in the future.* >>> >>> >>> But the world is not stable. >>> >>> >>> But presumably the *laws *are stable. Why? Because that's the way we >>> want them. If they weren't stable (or even time invariant) we wouldn't >>> call them laws of physics. They'd be initial conditions or historical >>> accidents. >>> >>> Brent >>> >>> >> The instability of the deSitter vacuum means gauge theories are not >> stable, and in fact are just local gauge redundancies that are not global >> in space or time. >> > > > Do you have any actual evidence that the deSitter vacuum is unstable? Or > is this just a speculative idea based on the idea of a string theory > landscape? > > Bruce > -- 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/7b74c32f-345e-4eed-babb-5d14bc71a7fdn%40googlegroups.com.
