On Sun, Sep 29, 2019 at 03:27:51PM -0700, 'Brent Meeker' via Everything List wrote: > > > On 9/29/2019 3:15 PM, Russell Standish wrote: > > On Fri, Sep 27, 2019 at 06:27:16PM -0700, 'Brent Meeker' via Everything > List wrote: > > When I wrote "lowest" I was assuming the context of MWI...not a single > universe. The Bekenstein bound implies that the Hubble volume has an > upper > bound for information capacity of it's surface area in Planck units. > This > number is around 2.4e106. So as I read Zurek, he thinks this > provides a kind > of probability cutoff and branches less probable than 0.4e-106 have > zero > probability. And, more to the point, in the limit of large N, where > N is the > number of degrees of freedom in the environment the off diagonal > terms of the > reduced density matrix go to zero; but this cutoff makes them exactly > zero for > N>2.41e106. I haven't figured out many branchings it would take to > reach this > number, but with some 1e98 particles it wouldn't take very many. > > Brent > > Its an interesting idea, and a plausible mechanism for denying the > "no cul-de-sac conjecture" and quantum immortality. > > However, I do have to wonder the significance of a 2.4x10^106 planck > distance quare hubble volume. This surely is a geographical factoid > rather than of fundamental significance. > > > It's not just geographical. The Bekenstein bound on the information that can > be contained within a the Hubble sphere depends on how big the sphere is which > in turn depends on the expansion rate of the universe. The expansion rate of > the universe might be a fundamental constant. > > Brent >
Wouldn't it also depend on when you are observing the universe? -- ---------------------------------------------------------------------------- Dr Russell Standish Phone 0425 253119 (mobile) Principal, High Performance Coders Visiting Senior Research Fellow [email protected] Economics, Kingston University http://www.hpcoders.com.au ---------------------------------------------------------------------------- -- 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/20190930011334.GD31717%40zen.
